TWI836076B - User control modality for led color tuning - Google Patents

Abstract

Various embodiments include apparatuses and methods enabling a control apparatus for color tuning a light-emitting diode (LED) array. In one example, a controllable-lighting apparatus includes an LED array having at least one desaturated red LED, at least one desaturated green LED, and at least one desaturated blue LED. A number of color-tuning and luminous-flux control devices includes an adjustable correlated color temperature (CCT)-control device for setting a desired color temperature of the LED array, an adjustable D_uv -control device for setting a desired overall color cast of the LED array along an isothermal CCT line corresponding to the desired color temperature, and an adjustable flux-control device for setting a desired luminous-flux value of the LED array. Other apparatuses and methods are described.

Description

User control mode for LED color tuning

The subject matter disclosed herein relates to color tuning of one or more light emitting diodes (LEDs) or LED arrays comprising a lamp that operates substantially in the visible portion of the electromagnetic spectrum. More specifically, the disclosed subject matter relates to a technique for enabling two color tuning devices and a luminous flux device to control two parameters of the color temperature and a brightness level of an LED array.

Light emitting diodes (LEDs) are commonly used in a variety of lighting operations. The color appearance of an object is determined in part by the spectral power density (SPD) of the light illuminating the object. For a human viewing an object, SPD is the relative intensity of various wavelengths within the visible spectrum. However, other factors can also affect color appearance. Furthermore, both the correlated color temperature (CCT) of the LED and the distance of the LED temperature on the CCT from a black body line (BBL, also known as the black body locus or Planck locus) can affect a human's perception of an object. In particular, there is a large market demand for LED lighting solutions in applications such as retail and hospitality lighting, where it is desirable to control both a color temperature and a brightness level of LEDs.

There are currently two main technologies for color tuning (e.g., white tuning) of LEDs. A first technology is based on white LEDs of two or more CCTs. A second technology is based on a combination of red/green/blue/amber. The first technology does not have a capability to tune the LED in the D _uv direction at all. In the second technology, color tuning capability is rarely provided as an available function. In those cases, the user is instead provided with a color wheel, usually based on a red-green-blue (RGB) or hue-saturation-lightness (HSL) model. However, the RGB and HSL models are not designed for general lighting. Both the RGB and HSL models are more suitable for graphics or photography applications.

The information described in this section is provided to provide those skilled in the art with a context for the subject matter disclosed below and should not be considered as admitted prior art.

In one embodiment, a control device for color tuning a light emitting diode (LED) array includes: a correlated color temperature (CCT) control device configured to be adjusted by an end user to a desired color temperature of an LED array, the CCT control device further configured to generate an output signal corresponding to the desired color temperature; a Duv control device configured to be adjusted by an end user to a desired Duv distance from a black body line (BBL) of the LED array, the Duv control device further configured to generate an output signal corresponding to the desired Duv distance from the BBL; an output signal corresponding to the desired color temperature, the desired Duv distance from the BBL, and the desired luminous flux value; a flux control device configured to be adjusted by an end user to a desired luminous flux value of the LED array, the flux control device further configured to generate an output signal corresponding to the desired luminous flux value; and a controller box including an LED driver circuit for providing current to at least two colors of LEDs in the LED array, the controller box configured to receive the output signal corresponding to the desired color temperature, the desired Duv distance from the BBL, and the desired luminous flux value and make a determination as to which of the at least two colors of LEDs receives the current.

In another embodiment, a controllable lighting device includes: an LED array having at least one desaturated red LED, at least one desaturated green LED, and at least one desaturated blue LED; and a color tuning and luminous flux control device, including: a correlated color temperature (CCT) control device configured to be adjusted by an end user to a desired color temperature of the LED array, the CCT control device further configured to generate an output signal corresponding to the desired color temperature; a Duv control device configured to be adjusted by an end user to a desired Duv distance from a black body line (BBL) of the LED array, the Duv control device further configured to generate an output signal corresponding to the desired Duv distance from the BBL; and a flux control device configured to be adjusted by an end user to a desired luminous flux value of the LED array, the flux control device further configured to generate an output signal corresponding to the desired luminous flux value.

In another embodiment, a method for setting parameters of a multicolor LED array includes: for each of a correlated color temperature (CCT) output signal, a Duv output signal, and a flux output signal: causing the The CCT output signal, the Duv output signal and the flux output signal are respectively related to a color temperature value, a Duv distance from a black body line (BBL) value and a luminous flux value; each of the related values is sent to A controller that controls a color temperature and an intensity level of the multi-color LED array; and controls an amount of current delivered to at least two colors of LEDs in the multi-color LED array.

This application claims priority to U.S. Provisional Application No. 62/849,229, filed on May 17, 2019, entitled “A USER CONTROL MODALITY FOR ILLUMINATION BASED ON CCT, DUV, AND DIMMING,” U.S. Application No. 16/457,130, filed on June 28, 2019, entitled “USER CONTROL MODALITY FOR LED COLOR TUNING,” and European Application No. 19205102.7, filed on October 24, 2019, entitled “USER CONTROL MODALITY FOR LED COLOR TUNING,” the disclosures of which are incorporated herein by reference in their entirety.

The disclosed subject matter will now be described in detail with reference to several general and specific embodiments as depicted in each of the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of one of the disclosed subject matter. However, it will be apparent to one skilled in the art that the disclosed subject matter may be practiced without some or all of these specific details. In other instances, well-known process steps or structures are not described in detail in order to avoid obscuring the disclosed subject matter.

Examples of different light illumination system and/or light emitting diode implementations will be described more fully below with reference to the accompanying drawings. These examples are not mutually exclusive, and features found in one example may be combined with features found in one or more other examples to achieve additional implementations. Accordingly, it will be understood that the examples shown in the accompanying drawings are provided for illustrative purposes only and are not intended to limit the present invention in any way. Throughout the text, similar numbers generally refer to similar elements.

In addition, it will be understood that although the terms first, second, third, etc. may be used herein to describe various elements. However, such elements should not be limited by such terms. Such terms may be used to distinguish one element from another element. For example, a first element may be referred to as a second element and a second element may be referred to as a first element without departing from the scope of the disclosed subject matter. As used herein, the term "and/or" may include any and all combinations of one or more of the associated listed items.

It will also be understood that when an element is referred to as being "connected" or "coupled" to another element, it can be connected or coupled to the other element directly and/or through one or more intervening elements. One component. In contrast, when an element is said to be "directly connected" or "directly coupled" to another element, there are no intervening elements between the element and the other element. It will be understood that these terms are intended to cover different orientations of the elements in addition to any orientation depicted in the figures.

Relative terms such as “below,” “above,” “upper,” “lower,” “horizontal” or “vertical” may be used herein to describe one element, zone or region relative to another element, zone or zone. a relationship, as shown in the figure. It will be understood that these terms are intended to cover different device orientations in addition to the one depicted in the figures. Additionally, whether LEDs, LED arrays, electrical components, and/or electronic components are housed on one, two, or more electronic boards may also depend on design constraints and/or a particular application.

Semiconductor-based light emitting devices or optical power emitting devices, such as devices that emit ultraviolet (UV) or infrared (IR) optical power, are among the most efficient light sources currently available. Such devices may include light emitting diodes, resonant cavity light emitting diodes, vertical cavity laser diodes, edge emitting lasers, or the like (referred to herein as LEDs). Due to their compact size and low power requirements, LEDs may be attractive candidates for many different applications. For example, LEDs can be used as light sources (eg, flashlights and camera flashes) for handheld battery-powered devices such as cameras and cellular phones. LEDs can also be used in applications such as automotive lighting, head-up display (HUD) lighting, horticultural lighting, street lighting, a video flashlight, general lighting (e.g., home, shop, office and studio lighting, theater/stage lighting, and architectural lighting), expansion Augmented reality (AR) lighting, virtual reality (VR) lighting (as backlight for displays) and IR spectrum. A single LED can provide no brighter light than an incandescent light source, and therefore, multi-junction devices or LED arrays (such as monolithic LED arrays, micro LED arrays, etc.) can be used in applications where enhanced brightness is desired or needed.

In various environments where LED-based lamps (or related lighting devices) are used to illuminate objects and for general illumination, in addition to controlling the relative brightness (eg, luminous flux) of an LED-based lamp (or individual lamp), there is also It may be desirable to control the color temperature of these lamps. Such environments may include, for example, retail locations as well as hospitality locations such as restaurants and the like. In addition to CCT, another lamp measurement is the color rendering index (CRI) of the lamp. CRI is defined by the International Commission on Illumination (CIE) and provides a quantitative measure of the ability of any light source (including LEDs) to accurately represent the color of various objects compared to an ideal or natural light source. The highest possible CRI value is 100. Another quantitative lamp indicator is _Duv . _Duv is an indicator defined in CIE 1960, for example, to represent the distance from a color point to BBL. If the color point is above BBL, _Duv is a positive value and if the color point is below BBL, _Duv is a negative value. Color points above BBL appear green and color points below BBL appear pink. The disclosed subject matter provides a device for controlling the color temperature (CCT and _Duv ) and a brightness level of the lamp. As described in this article, in color tuning applications, color temperature is related to both CCT and _Duv .

Thus, the disclosed subject matter is directed to a color tuning (covering both CCT and Duv) and luminous flux (e.g., "brightness level") solution for driving LEDs of various colors (including, for example, primary color (red-green-blue or RGB) LEDs or desaturated ( _pastel ) RGB color LEDs) to produce lamps having various color temperatures with a high color rendering index (CRI) and high efficiency, and in particular, to address the color mixing problems of using phosphor-converted color LEDs.

As is known in the related art, the forward voltage of direct color LEDs decreases as the dominant wavelength increases. These LEDs can be driven using, for example, multi-channel DC to DC converters. Advanced phosphor-converted color LEDs have been created targeting high efficiency and CRI, thereby opening new possibilities for correlated color temperature (CCT) tuning applications. Some advanced color LEDs have desaturated color points and can be mixed to have a white color of 90+ CRI over a wide CCT range. Other LEDs with 80+ CRI implementations or even 70+ CRI implementations may also be used with the disclosed subject matter. These possibilities are achieved using LED circuits that increase or maximize this potential. At the same time, the control circuit described in this article is compatible with single-channel constant current drivers to facilitate market adoption.

As is known to those skilled in the art, since the light output of an LED is proportional to the amount of current used to drive the LED, dimming an LED can be accomplished, for example, by reducing the forward current delivered to the LED. In addition to or instead of varying the amount of current used to drive each of several individual LEDs, a controller box (described in detail below with reference to Figure 5) can switch between an "on" state and an "off" state. Quickly switch the selected LED to achieve the appropriate dimming level and color temperature of the selected lamp.

Typically, an LED driving circuit is formed using an analog driver method or a pulse width modulation (PWM) driver method. In an analog driver approach, all colors are driven simultaneously. Each LED is driven independently by providing a different current to each LED. Analog drivers cause a color shift and currently there is no way to shift the current into one of three ways. Analog driving often results in driving certain color LEDs into a low current mode and into a very high current mode at other times. This wide dynamic range poses a challenge to sensing and control hardware.

In a PWM driver, each color is turned on sequentially at high speed. Each color is driven with the same current. The mixed color is controlled by changing the duty cycle of each color. That is, one color can be driven twice as long as another color to add to the mixed color. Since human vision cannot perceive very fast changing colors, the light appears to have only a single color.

For example, a first LED (of a first color) is driven cyclically at a current for a predetermined amount of time, then a second LED (of a second color) is driven cyclically at the same current for a predetermined amount of time, and then a third LED (of a third color) is driven cyclically at the current for a predetermined amount of time. Each of the three predetermined amounts of time can be the same amount of time or different amounts of time. Thus, by varying the duty cycle of each color, the mixed color is controlled. For example, if you have an RGB LED and want a specific output, then based on the perception of the human eye, red may be driven for part of the cycle, green for a different part of the cycle, and blue for another part of the cycle. Instead of driving the red LED with a lower current, the red LED is driven with the same current for a shorter time. This example demonstrates the disadvantage of PWM: the LED is poorly utilized, thus resulting in an inefficient use of power. In some embodiments, the current is supplied from a voltage controlled current source.

Another advantage of the disclosed subject matter over the prior art is that the desaturated RGB approach can produce tunable light on and off the BBL, and produce tunability on the BBL (an isothermal CCT line (described below)) while maintaining a high CRI. In contrast, various other prior art systems utilize a CCT approach in which the tunable color point falls on a straight line between the two primary colors of the LED (e.g., R-G, R-B, or G-B).

FIG. 1 shows a portion of a Commission Internationale de l'Eclairage (CIE) color chart 100, including a black body line (BBL) 101 (also known as the Planckian locus) that forms a basis for understanding various embodiments of the subject matter disclosed herein. BBL 101 shows the chromaticity coordinates of a black body radiator of varying temperature. It is generally agreed that in most lighting situations, a light source should have a chromaticity coordinate that lies on or near BBL 101. Various mathematical procedures known in the art are used to determine the "closest" black body radiator. As noted above, this common lamp specification parameter is called the correlated color temperature (CCT). A useful and complementary _way to further describe chromaticity is provided by the _Duv value, which is an indication of the extent to which a lamp's chromaticity coordinates lie above the BBL 101 (a positive _Duv value) or below the BBL 101 (a negative _Duv value).

The color chart portion is shown as containing several isotherms 117 . Even if each of these isotherms is not on BBL 101, any color point on isotherm 117 has a constant CCT. For example, a first isotherm 117A has a CCT of 10,000 K, a second isotherm 117B has a CCT of 5,000 K, a third isotherm 117C has a CCT of 3,000 K, and a fourth isotherm 117B has a CCT of 5,000 K. Line 117D has a CCT of 2,200 K.

Continuing with reference to FIG. 1 , the CIE color chart 100 also shows several ellipses representing a Markdown ellipse (MAE) 103 that is centered on the BBL 101 and extends one step 105 and three steps in distance from the BBL 101 107, five steps 109 or seven steps 111. The MAE is based on psychological research and defines a region on the CIE chromaticity diagram containing all colors that a typical observer cannot distinguish from the color at the center of the ellipse. Thus, each of MAE steps 105 to 111 (one step to seven steps) is viewed by a typical observer as substantially the same color as the color at the center of each of MAE 103. A series of curves 115A, 115B, 115C, and 115D represent substantially equal distances from the BBL 101 and are associated with D _uv values such as +0.006, +0.003, 0, -0.003, and -0.006, respectively.

Referring now to FIG. 2A and with continued reference to FIG. 1 , FIG. 2A shows a chromaticity diagram 200 having a red (R) LED at coordinate 205, a green (G) LED at coordinate 201, and a blue (G) LED at coordinate 203. B) Approximate chromaticity coordinates of colors with typical coordinate values for LEDs (as indicated on the x-y scale of chromaticity diagram 200). Figure 2A shows an example of a chromaticity diagram 200 used to define the wavelength spectrum of a visible light source, according to some embodiments. The chromaticity diagram 200 of Figure 2A is merely one way of defining the wavelength spectrum of a visible light source; other suitable definitions are known in the art and may be used with various implementations of the disclosed subject matter described herein. Example used together.

A convenient way to specify a portion of chromaticity diagram 200 is through a set of equations in the x-y plane, where each equation has a locus of solutions that define a line on chromaticity diagram 200. The lines may intersect to specify a particular region, as described in more detail below with reference to FIG. 2B. As an alternative definition, a white light source may emit light corresponding to the light from a black body light source operating at a given color temperature.

Chromaticity diagram 200 also shows BBL 101 as described above with reference to FIG. 1. Each of the three LED coordinate positions 201, 203, 205 is the CCT coordinate of a "fully saturated" LED of green, blue, and red, respectively. However, if a "white light" is produced by combining a specific ratio of R, G, and B LEDs, the combined CRI will be very low. Typically, in environments described above, such as retail or hospitality venues, a CRI of about 90 or higher is desired.

2B shows a modified version of the chromaticity diagram 200 of FIG. 2A with approximate chromaticity coordinates of desaturated R, G, and B LEDs near BBL, desaturated R, G, and B, in accordance with various embodiments of the disclosed subject matter. B LEDs have a color rendering index (CRI) of approximately 90+ within a defined color temperature range.

However, the chromaticity diagram 250 of FIG. 2B shows approximate chromaticity coordinates of desaturated (pastel) R, G, and B LEDs proximate to the BBL 101. The coordinate values of a desaturated red (R) LED at coordinate 255, a desaturated green (G) LED at coordinate 253, and a desaturated blue (B) LED at coordinate 251 are shown (as indicated on the x-y scale of the chromaticity diagram 250). In various embodiments, the desaturated R, G, and B LEDs may have a color temperature range from about 1800 K to about 2500 K. In other embodiments, the desaturated R, G, and B LEDs may be in a color temperature range of, for example, about 2700 K to about 6500 K. In still other embodiments, the desaturated R, G, and B LEDs may be in a color temperature range of about 1800 K to about 7500 K. In yet other embodiments, the desaturated R, G, and B LEDs may be selected to be within a wide color temperature range. As noted above, the color rendering index (CRI) of a light source does not indicate the apparent color of the light source; that information is given by the correlated color temperature (CCT). Thus, the CRI is a quantitative measure of a light source's ability to faithfully render the colors of various objects compared to an ideal or natural light source.

In a specific example embodiment, a triangle 257 is also shown formed between each of the coordinate values of the desaturated R, G, and B LEDs. The desaturated R, G, and B LEDs are formed (eg, by a mixture of phosphors and/or a mixture of materials that form LEDs as is known in the art) to have coordinate values close to BBL 101. Thus, the coordinate positions of the R, G, and B LEDs are each desaturated, and as outlined by triangle 257, have a CRI of approximately 90 or greater and an approximate tunable color temperature range of, for example, about 2700 K to about 6500 K. Therefore, a correlated color temperature (CCT) can be selected in the color tuning applications described herein such that all combinations of selected CCTs result in lamps with a CRI of 90 or greater. Each of the desaturated R, G, and B LEDs may form a single LED or an array (or group) of LEDs, where each LED within the array or group has the same or similar properties as the other LEDs in the array or group. One desaturated color. A combination of one or more desaturated R, G and B LEDs forms a lamp.

2C shows a modified version of the chromaticity diagram 200 of FIG. 2A with approximate chromaticity coordinates of a desaturated R, G, and B LED close to the BBL, having a color rendering index (CRI) of approximately 80+ and within a defined color temperature range wider than that of the desaturated R, G, and B LED of FIG. 2B , in accordance with various embodiments of the disclosed subject matter.

However, the chromaticity diagram 270 of FIG. 2C shows the approximate chromaticity coordinates of the desaturated R, G, and B LEDs positioned further from the BBL 101 than the desaturated R, G, and B LEDs of FIG. 2B. Coordinate values are shown for a desaturated red (R) LED at coordinate 275, a desaturated green (G) LED at coordinate 273, and a desaturated blue (B) LED at coordinate 271 (as in the chromaticity diagram 270 on the x-y scale). In various embodiments, the desaturated R, G, and B LEDs may have a color temperature range ranging from about 1800 K to about 2500 K. In other embodiments, the desaturated R, G, and B LEDs may have a color temperature ranging from about 2700 K to about 6500 K. In yet other embodiments, the desaturated R, G, and B LEDs may be in a color temperature range of about 1800 K to about 7500 K.

In a specific example embodiment, a triangle 277 is also shown formed between each of the coordinate values of the desaturated R, G, and B LEDs. The desaturated R, G, and B LEDs are formed (eg, by a mixture of phosphors and/or a mixture of materials that form LEDs as is known in the art) to have coordinate values close to BBL 101. Thus, the coordinate positions of the R, G, and B LEDs are each desaturated, and as outlined by triangle 277, have a CRI of approximately 80 or greater and an approximate tunable color temperature range of, for example, about 1800 K to about 7500 K. Since the color temperature range is greater than that shown in Figure 2B, the CRI is proportionally reduced to about 80 or greater. However, one of ordinary skill will recognize that desaturated R, G, and B LEDs can be produced to have individual color temperature ranges anywhere on the chromaticity diagram. Therefore, a correlated color temperature (CCT) can be selected in the color tuning applications described herein such that all combinations of selected CCTs result in lamps with a CRI of 80 or greater. Each of the desaturated R, G, and B LEDs may form a single LED or an array (or group) of LEDs, where each LED within the array or group has the same or similar properties as the other LEDs in the array or group. One desaturated color. A combination of one or more desaturated R, G and B LEDs forms a lamp.

Figure 3 shows a prior art color tuning device 300 that requires a separate flux control device 301 and a separate CCT control device 303. The flux control device 301 is coupled to a single channel driver circuit 305 and the CCT control device is coupled to a combined LED driver circuit/LED array 320 . The combined LED driver circuit/LED array 320 may be a current driver circuit, a PWM driver circuit, or a hybrid current driver/PWM driver circuit. Each of the flux control device 301, the CCT control device 303, and the single channel driver circuit 305 are located in a customer facility 310 and all devices must be installed with applicable national and local regulations governing high voltage circuits. The combined LED driver circuit/LED array 320 is typically located remotely from the customer facility 310 . Therefore, both the initial purchase price and the installation price can be very high.

FIG. 4 shows a color tuning device 400 of the prior art using a single control device 401. The single control device 401 is coupled to a single channel driver circuit 403, both within a customer installation area 410. The single channel driver circuit 403 is coupled to a combination LED driver circuit/LED array 420. The combination LED driver circuit/LED array 420 is typically located remote from the customer installation area 410 (but typically still within a customer facility). The color tuning device 400 uses a single device to control both the light flux (and light intensity) and the color temperature. As the light flux (intensity) of the LED array decreases, the color temperature of the LED array also decreases. Conversely, as the intensity of the LED array increases, the color temperature of the LED array also increases.

Referring now to FIG. 5 , an example of a high-level schematic 500 of a color tuning and light flux control device 550, a controller box 530, a plurality of control switches 520 (e.g., a multiplexer array), and a desaturated LED array 510 including desaturated LEDs such as those of FIGS. 2B and 2C is shown in accordance with various embodiments of the disclosed subject matter. The LED array 510 is shown as including desaturated LEDs such as (an “R” LED 511, a “G” LED 513, and a “B” LED 515), although the high-level schematic 500 is not necessarily limited to these colors. Rather, these colors are presented to facilitate understanding of various novel features of the disclosed subject matter. The "R" LED 511, the "G" LED 513, and the "B" LED 515 constitute an LED array 510 (e.g., a lamp). Furthermore, each of the "R" LED 511, the "G" LED 513, and the "B" LED 515 may be composed of one or more LEDs of an appropriate desaturated color (e.g., R, G, or B). Since the LED array 510 includes, for example, an "R" LED 511 color, a "G" LED 513 color, and a "B" LED 515 color, the LED array 510 may be considered a multi-color LED array.

As is known to those skilled in the art, since the light output of an LED is proportional to the amount of current used to drive the LED, dimming an LED can be accomplished, for example, by reducing the forward current delivered to the LED. The controller box 530 reads the converted signal transmitted from the color tuning and luminous flux control device 550 (eg, converted from an analog signal to a digital signal through an analog-to-digital converter 531 (A/D converter or ADC)) and A predetermined amount of current is sent to one, two, or all three LEDs to change one of the overall CCT and/or _Duv levels of the LED array 510.

In addition to or instead of changing the amount of current used to drive each of the "R" LED 511, "G" LED 513, and "B" LED 515 513 and "B" LED 515, the controller box 530 can control the amount of current in each of the individual LEDs 513 and "B" 515 based on the desired intensity as indicated by an end user setting a desired brightness level on the flux control device 555. Quickly switches the selected LED between the "on" and "off" states to achieve an appropriate dimming level for the selected lamp. In an embodiment, controller box 530 may be a three-channel converter known in the art. Upon reading and understanding the disclosed subject matter, one of ordinary skill will recognize that the individual LEDs that comprise LED array 510 may also be controlled in other ways.

According to various embodiments of the disclosed subject matter, the color tuning and luminous flux control device 550 includes three separate devices (although they may be physically grouped into a single device), including a CCT control device 551, a D _uv control device 553 and a flux control device 555. One or more of the three devices may include an electrical control device, a mechanical control device, or a software control device (described in more detail with reference to Figure 6). These control devices can be based on analog or digital signals. If one or more of the devices is based on an analog output, the controller box 530 includes an analog-to-digital converter (ADC) 531 . In various embodiments, one or more of the control devices may include a voltage divider. In other embodiments, one or more of the control devices include various types of capacitively or resistively coupled current or voltage output devices known in the art. All three devices may include the same type of control device or various types of control devices.

For example, in one particular example embodiment, one or more of CCT control device 551, _Duv control device 553, and flux control device 555 may be one of 0 to 10 volts adapted for use as a one-dimensional control Dimmer device. As is known in the art, 0 volt to 10 volt dimmer devices are traditionally used for flux dimming. For example, one position of a rotary or linear potentiometer or rheostat may be used to output a signal in the range of (inclusive) 0 volts to (inclusive) 10 volts.

In other embodiments, each of the CCT control device 551, the _Duv control device 553, and the flux control device 555 may be electrically or mechanically based. The devices may be analog or digital. In some embodiments, the devices may be implemented by physical knobs, dials, sliders, scroll wheels, toggle switches, and/or their various equivalents. In another embodiment, the CCT control device 551, the _Duv control device 553, and the flux control device 555 may be implemented as, for example, a resistive/capacitive touch panel with or without an integrated display. This embodiment is described in more detail below with reference to FIG. 6.

An algorithm may be used to accept the output signal (e.g., in analog or digital form) and convert the output signal into one of three control signals. For example, the algorithm may correlate a 9.7 V output signal from the CCT control device 551 to a 6350 K color temperature of the LED array 510. The controller box 530, described in more detail below, then sends signals to turn "on" or "off" each of the control switches 520 521, 523, 525 in rapid succession so that a human observer perceives the LED array 510 as emitting a color temperature of 6350 K (e.g., a mixture of primarily green and blue light). Substantially simultaneously, the algorithm may cause a 4.0 V output signal from the _Duv control device 553 to correlate to a _Duv negative value of -0.003, or a slightly pink value just below the BBL 101 of FIG. 1 , along the isothermal CCT line of 6350 K, as discussed above. Thus, the controller box 530 again sends signals to turn "on" or "off" each of the control switches 520 521 , 523 , 525 in rapid succession such that a human observer perceives the LED array 510 as emitting a color temperature of 6350 K, but now with a slightly pink color cast. Finally, the algorithm can relate a 5.7 V output signal from the flux control device 555 to an intensity level of the LED array 510 to have an intensity level of 57% of full brightness (in this example, the controller box 530 receives 5.7 volts or 10% from a device with a maximum output voltage of 10 volts). ). The controller box 530 then continues to send signals to "turn on" and "turn off" the control switch 520 to achieve a color temperature of 6350 K according to a D _uv adjustment of -0.003. However, the total value of the current sent to the LED array 510 is now 57% of the maximum operating current available. In various embodiments, the algorithm determines that each of the CCT control device 551, the D _uv control device 553, and the flux control device 555 is monotonically related (one-to-one correspondence) to their respective algorithm output values.

In other embodiments, an output signal may be associated with a look-up table (LUT) to convert the output signal into one of three control signals. In such embodiments, the controller box 530 may be used to receive and read an output signal (eg, in analog or digital form) and convert the output signal into one of three control signals. For example, the controller box 530 receives a 3.5 V output signal from the CCT control device 551 . The LUT indicates a 3.5 V output signal corresponding to one of the LED arrays 510 with a 3400 K color temperature. As noted above with reference to the algorithm embodiment, the controller box 530 then sends signals to turn "on" or "off" each of the control switches 520 521 , 523 , 525 in rapid succession such that a human observer will turn the LED array 510 Perceived as emitting a color temperature of 3400 K (e.g., a mixture of primarily green and red light). Substantially simultaneously with receiving and reading a value of the output signal from the CCT control device 551, an output signal, such as 8.5 V, from the _Duv control device 553 may be related to a positive _Duv value of +0.006 in the LUT. The associated D _uv value of +0.006 is slightly higher than that of BBL 101 in Figure 1, which now has a slightly greener value along the isothermal CCT line of 3400 K, as discussed above. Therefore, the controller box 530 again sends signals to turn "on" or "off" each of the control switches 520 521, 523, 525 in rapid succession such that a human observer perceives the LED array 510 as emitting a color temperature of 3400 K , but now has a slightly greenish color cast. Ultimately, the LUT can correlate a 10.0 V output signal from the flux control device 555 to an intensity level of the LED array 510 to have an intensity level of 100% of full brightness. Furthermore, as described above with respect to the algorithm embodiment, the controller box 530 continues to send signals to turn the control switch 520 "on" and "off" to adjust the color temperature by a _Duv of +0.006 to achieve a color temperature of 3400 K. However, the total value of current sent to LED array 510 is now 100% of the maximum operating current available. In various embodiments, the lookup table is configured to determine that each of the CCT control device 551, the _Duv control device 553, and the flux control device 555 has a monotonic relationship (one-to-one correspondence) with its respective LUT output value.

Thus, in the LUT embodiment, each of the signals received and read from the CCT control device 551, the _Duv control device 553, and the flux control device 555 functions in a manner similar to that described above with reference to the algorithm embodiment. The difference is that the lookup table embodiment receives a voltage signal and then consults a LUT for one of the corresponding CCT color temperatures, _Duv values, or dimming values for driving each of the "R" LED 511, the "G" LED 513, and the "B" LED 515 in the LED array 510, rather than applying the received voltage signal to an algorithm. In various embodiments, the algorithm embodiment and the LUT embodiment may be used simultaneously. For example, the output signals from the CCT control device 551 and the D _uv control device 553 may function and relate under an algorithmic embodiment, while the output signal from the flux control device 555 may function and relate under a LUT embodiment.

Each of the algorithm embodiments and the LUT embodiments may be executed using, for example, one or more microcontrollers (not shown) or other device types (e.g., hardware, firmware, and/or software devices) described below. Various device types may be defined as modules. As noted above, one or more microcontrollers of a module may be embedded, for example, in a controller box 530, or included in each of the CCT control device 551, the D _uv control device 553, and the flux control device 555, or in a microcontroller placed proximate to the control device (e.g., adjacent to an electrical box or in a separate box adjacent to the electrical box housing the control device). A controller box 530 is described below with reference to FIG. 5.

Additionally, some or all of these modules may be included within controller box 530. In some embodiments, the modules may also include software-based modules (e.g., program code stored or otherwise embodied in a machine-readable medium or a transmission medium), hardware modules, or the like. Any suitable combination. A hardware module is a tangible (e.g., non-transitory) physical component (e.g., a set of one or more microcontrollers or microprocessor or other hardware-based device). One or more modules may be configured or configured in a specific physical manner. In various embodiments, one or more microcontrollers or microprocessors or one or more hardware modules thereof may be configured as a hardware module by software (eg, an application or portion thereof). The hardware module operates to perform the operations described in this article for that module.

In some example embodiments, a hardware module may be implemented, for example, mechanically or electronically or by any suitable combination thereof. For example, a hardware module may include dedicated circuitry or logic that is permanently configured to perform specific operations. A hardware module may be or include a dedicated processor, such as a field programmable gate array (FPGA) or an application specific integrated circuit (ASIC). A hardware module may also include programmable logic or circuitry that is temporarily configured by software to perform specific operations, such as interpreting the output signal received from the color tuning and light flux control device 550 into a specific CCT, _Duv, or flux value through an algorithm or LUT described above. As an example, a hardware module may include software contained within a CPU or other programmable processor. It will be appreciated that the decision to implement a hardware module mechanically, electrically, in a dedicated and permanently configured circuit, or in a temporarily configured circuit (e.g., configured by software) may be driven by cost and time considerations.

In various embodiments, the controller box 530 may include a hybrid LED driver circuit for CCT and _Duv tuning. The hybrid driver circuit may include an LED driver for generating a stable LED driver current. Therefore, the hybrid driving circuit provides current to at least two of the "R" LED 511, "G" LED 513, and "B" LED 515 that constitute the LED array 510. In a specific example embodiment, control switch 520 delivers current to the appropriate LED based on, for example, desired CCT and _Duv tuning. Next, the hybrid drive circuit within the controller box 530 can be overlaid with PWM time division to direct current to at least two of the "R" LED 511, "G" LED 513, and "B" LED 515 that make up the LED array 510.

In various embodiments, the controller box 530 and/or microcontroller (or other module) described above may be configured to have a particular calibration mode. This calibration mode can work with algorithms (although the user may need to access the underlying software or firmware to change the values) or with values in a LUT. For example, the controller box 530 may enter the calibration mode if the controller box 530 cycles power in a particular sequence (eg, a combination of long and short power on/off cycles). When in this calibration mode, the user (for example, a factory calibration technician or an advanced end user) is required to change the correlation values of the output signals of the three control devices to their respective control values (CCT, D _uv and flux). The controller box 530 then stores the two algorithms or values in software or hardware (e.g., a Field Programmable Gate Array (FPGA)), such as in an internal memory or firmware (e.g., an EEPROM). . Internal memory can take several forms, including, for example, electrically erasable programmable read-only memory (EEPROM), phase change memory (PCM), flash memory, or various other types of non-volatile memory known in the art. sexual memory.

FIG6 shows an example embodiment of the color tuning and light flux control device 550 of FIG5 implemented on a display screen 600 according to various example embodiments of the disclosed subject matter. In this example, the display screen 600 shows a first channel 610 for controlling the D _uv distance from the BBL of the LED array 510 (see, e.g., FIG1 ), a second channel 620 for controlling the CCT of the LED array 510, and a third channel 630 for controlling the light flux (intensity) of the LED array 510. Each of the channels may be a separate portion of the same display screen 600 or may comprise three separate portions that, when combined, comprise the display screen 600.

The first channel 610 includes a first button 611 for decreasing the value of the _Duv distance from the BBL and a second button 613 for increasing the _Duv distance from the BBL to control the _Duv portion of the color tuning of the LED array 510. The value selected for _Duv may then be displayed on a _Duv display portion 615.

The second channel 620 includes a first button 621 for decreasing the value of CCT and a second button 623 for increasing the value of the selected CCT to control the CCT portion of the LED array 510. The value selected for the CCT may then be displayed on a CCT display portion 625 of the display screen 600.

The third channel 630 includes a first button 631 for decreasing the value of the luminous flux (intensity or brightness level of the LED array 510) and a second button 633 for increasing the value of the luminous flux of the LED array 510. The value selected for the luminous flux may then be displayed on a luminous flux display portion 635 of the display screen 600.

As one of ordinary skill will appreciate, in some embodiments, some or all buttons 611, 613, 621, 623, 631, 633 may include "soft buttons" implemented on, for example, a touch-sensitive version of display screen 600. In other embodiments, some or all buttons 611, 613, 621, 623, 631, 633 may include hardware-implemented buttons formed in display screen 600 (eg, a momentary contact switch or other type of hardware-based switch ). In other embodiments, some or all buttons 611 , 613 , 621 , 623 , 631 , 633 may comprise hardware-implemented buttons, such as being a capacitance-based portion of display screen 600 . In yet other embodiments, a combination of one of the button types may be used.

Referring now to FIG. 7 , an example method for setting the CCT, D _uv and luminous flux parameters of the LED array 510 of FIG. 5 is shown. The method begins at operation 701, where initial (or updated, depending on whether any values from one or more of CCT control device 551, _Duv control device 553, and flux control device 555 have been set) parameter settings (CCT, D _uv and flux) initial value. Each of the three parameters that can be set for the LED array 510 includes a separate branch. A CCT branch 710 receives and reads input signals related to setting the CCT of the LED array 510 and correlates the CCT signals with instructions for the controller box 530 . A D _uv branch 720 receives and reads input signals related to setting the D _uv of the LED array 510 and correlates the D _uv signals with instructions for the controller box 530 . A flux branch 730 receives and reads input signals related to setting the flux of the LED array 510 and correlates the received flux signals with instructions for the controller box 530 .

Referring now to the CCT branch 710, at operation 703, a CCT output signal is received and read from, for example, the CCT control device 551 (see FIG. 5) or the second channel 620 (see FIG. 6) of the display screen 600. At operation 705, the received CCT output signal is correlated with a desired color temperature indicative of a setting from the CCT control device 551 or the second channel 620. As described above, in one embodiment, the correlation may occur by providing a value of the CCT output signal as an input to a CCT signal to color temperature algorithm. In another embodiment, the correlation may occur by providing a value of the CCT output signal as an input to a lookup table. Then, at operation 707, the correlated output value from the algorithm or LUT is sent as a signal (e.g., analog or digital) to the controller box 530. At operation 721, the signal is interpreted in the controller box 530 to send appropriate current levels and/or PWM signals to at least two of the three colors in the LED array 510 substantially simultaneously based on the received CCT output signal.

Referring now to _Duv branch 720, at operation 709, a _Duv output signal is received and read from, for example, _Duv control device 553 (see Figure 5) or first channel 610 (see Figure 6) of display screen 600. At operation 711, the received _Duv output signal is correlated with a desired _Duv value indicative of one of the settings from _Duv control device 553 or first channel 610. As described above, in one embodiment, this correlation may occur by providing a value of the _Duv output signal as an input to an algorithm structure to correlate the _Duv signal with the _Duv distance from the BBL. In another embodiment, the correlation may occur by providing a value of the _Duv output signal as an input to a lookup table. Next, at operation 713, the associated output value from the algorithm or LUT is sent to the controller box 530 as a signal (eg, analog or digital). At operation 721 , the signal is interpreted in controller box 530 to substantially simultaneously send appropriate current levels and/or PWM signals to at least two of the three colors in LED array 510 based on the received _Duv output signal. .

In the flux branch 730 of the method 700, at operation 715, a flux output signal is received and read from, for example, the flux control device 555 (see FIG. 5) or the third channel 630 (see FIG. 6) of the display screen 600. At operation 717, the received flux output signal is correlated with a desired light flux level indicative of a setting from the flux control device 555 or the third channel 630. In one embodiment, the correlation may occur by providing a value of the flux output signal as an input to a light flux signal versus flux intensity algorithm. In another embodiment, the correlation may occur by providing a value of the flux output signal as an input to a lookup table. Then, at operation 719, the correlated output value from the algorithm or LUT is sent as a signal (e.g., analog or digital) to the controller box 530. At operation 721, the signal is interpreted in the controller box 530 to send appropriate current levels and/or PWM signals to at least two of the three colors in the LED array 510 substantially simultaneously based on the received flux output signal.

At operation 723, the method checks (eg, polls) for any new/revised signals from the color tuning and luminous flux control device 550 or the display screen 600. If one or more new signals are sensed at operation 725, the method begins again at operation 701.

Upon reading and understanding the disclosed subject matter, one of ordinary skill will recognize that the method may be applicable to LEDs of traditional RGB colors or LEDs of desaturated RGB colors. Those familiar with this technology will also recognize that additional or fewer color LEDs can be used.

In various embodiments, many of the described components may include one or more modules configured to implement the functionality disclosed herein. In some embodiments, the modules may constitute software modules (e.g., program code stored in or otherwise embodied in a machine-readable medium or a transmission medium), hardware modules, or any suitable combination thereof. A "hardware module" is a tangible (e.g., non-transitory) physical component (e.g., a set of one or more microprocessors or other hardware-based devices) that is capable of performing specific operations and interpreting specific signals. One or more modules may be configured or arranged in a specific physical manner. In various embodiments, one or more microprocessors or one or more hardware modules thereof may be configured by software (eg, an application or portion thereof) as a hardware module that operates to perform the operations described herein for that module.

In some example embodiments, a hardware module may be implemented, for example, mechanically or electronically, or by any suitable combination thereof. For example, a hardware module may contain specialized circuitry or logic that is permanently configured to perform specific operations. A hardware module may be or include a special purpose processor, such as a field programmable gate array (FPGA) or an application specific integrated circuit (ASIC). A hardware module may also include programmable logic or circuitry that is temporarily configured by software to perform specific operations, such as interpreting various states and transitions within a finite state machine. As an example, a hardware module may include software included within a CPU or other programmable processor. It will be appreciated that cost and time considerations may drive the decision to implement a hardware module mechanically, electrically, in dedicated and permanently configured circuitry, or in temporarily configured circuitry (eg, configured by software).

The above description contains illustrative examples, devices, systems, and methods that embody the disclosed subject matter. In this description, for purposes of explanation, numerous specific details are set forth in order to provide an understanding of the various embodiments of the disclosed subject matter. However, it will be apparent to one of ordinary skill that various embodiments of the subject matter may be practiced without such specific details. Additionally, well-known structures, materials, and techniques have not been shown in detail so as not to obscure the illustrated embodiments.

As used herein, the term "or" may be interpreted in an inclusive or exclusive sense. Furthermore, other embodiments will be understood by those of ordinary skill upon reading and understanding the disclosure provided. In addition, after reading and understanding the disclosure provided herein, a person of ordinary skill will easily understand that various combinations of the techniques and examples provided herein can be applied in various combinations.

Although each embodiment is discussed individually, these individual embodiments are not intended to be regarded as independent technologies or designs. As indicated above, each of the various parts may be interrelated and each part may be used alone or in combination with other types of electrically controlled devices, such as dimmers and related devices. Thus, although various embodiments of methods, operations, and procedures have been described, these methods, operations, and procedures may be used individually or in various combinations.

Accordingly, it will be apparent to one of ordinary skill that many modifications and variations may be made upon reading and understanding the disclosure provided herein. Based on the foregoing description, in addition to the functions and methods enumerated herein, functionally equivalent methods and devices within the scope of the present invention will also be apparent to those skilled in the art. Portions and features of some embodiments may be included in, or substituted for, those of other embodiments. Such modifications and changes are intended to fall within the scope of the patent application for the accompanying invention. Accordingly, the present invention is limited only by the terms of the appended invention claims together with the full scope of equivalents to which such invention claims are entitled. It is also to be understood that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting.

The [Chinese] of the present invention is provided to allow the reader to quickly determine the nature of the technical invention. When submitting the abstract, it should be understood that it will not be used to interpret or limit the scope of the invention. In addition, in the above [Implementation Method], it can be understood that various features can be combined together in a single embodiment for the purpose of simplifying the present invention. The method of the present invention should not be interpreted as limiting the scope of the invention. Therefore, the scope of the invention application below is hereby incorporated into the [Implementation Method], in which each claim item is independently regarded as a separate embodiment.

100: International Commission on Illumination (CIE) color table 101: Black body line (BBL) 103: Markdown ellipse (MAE) 105: MAE step 107: MAE step 109: MAE step 111: MAE step 115A: Curve 115B: Curve 115C: Curve 115D: Curve 117: Isotherm 117A: First isotherm 117B: Second isotherm 117C: Third isotherm 117D: Fourth isotherm 200: Chromaticity diagram 201: Coordinates/LED Coordinate position 203: coordinate/LED coordinate position 205: coordinate/LED coordinate position 250: chromaticity diagram 251: coordinate 253: coordinate 255: coordinate 257: triangle 270: chromaticity diagram 271: coordinate 273: coordinate 275: coordinate 277: triangle 300: Color Tuning Devices 301: Flux Control Devices 303: Correlated Color Temperature (CCT) Control Devices 305: Single Channel Driver Circuits 310: Customer Facilities 320: Combination Light Emitting Diode (LED) Driver Circuits/LED Arrays 400: Color Tuning Devices 401: Control device 403: Single channel driver circuit 410: Customer installation area 420: Combination LED driver circuit/LED array 500: High-level schematic 510: Desaturation LED array 511: "R" LED 513: "G" LED 515: "B LED 520: Control switch 521: Control switch 523: Control switch 525: Control switch 530: Controller box 531: Analog to digital converter (ADC) 550: Color tuning and luminous flux control device 551: CCT control device 553: D _uv Control device 555: Flux control device 600: Display screen 610: First channel 611: First button 613: Second button 615: D _uv display part 620: Second channel 621: First button 623: Second button 625: CCT display part 630: Third channel 631: First button 633: Second button 635: Luminous flux display part 700: Method 701: Operation 703: Operation 705: Operation 707: Operation 709: Operation 710: CCT branch 711: Operation 713: Operation 715: Operation 717: Operation 719: Operation 720: D _uv branch 721: Operation 723: Operation 725: Operation 730: Flux branch

FIG1 shows a portion of a Commission Internationale de l'Eclairage (CIE) color table, including a black body line (BBL);

FIG. 2A shows a chromaticity diagram with approximate chromaticity coordinates of typical red (R), green (G), and blue (B) LED colors;

FIG. 2B shows a modified version of the chromaticity diagram of FIG. 2A with approximate chromaticity coordinates of desaturated R, G, and B LEDs near the BBL, the desaturated R, G, and B LEDs having a color rendering index (CRI) of approximately 90+ and within a defined color temperature range in accordance with various embodiments of the disclosed subject matter;

FIG. 2C shows a modified version of the chromaticity diagram of FIG. 2A with approximate chromaticity coordinates of a desaturated R, G, and B LED near the BBL, the desaturated R, G, and B LED having a color rendering index (CRI) of approximately 80+ and within a defined color temperature range wider than the desaturated R, G, and B LED of FIG. 2B in accordance with various embodiments of the disclosed subject matter;

Figure 3 shows a prior art color tuning device that requires a separate flux control device and a separate CCT control device;

FIG. 4 shows another color tuning device of the prior art using a single control device that controls both the color temperature and intensity of an LED;

5 shows an example of a high-level schematic diagram of a color tuning and luminous flux control device, a controller box, and a desaturated LED array including, for example, the desaturated LEDs of FIGS. 2B and 2C , in accordance with various embodiments of the disclosed subject matter. ;

FIG. 6 shows an exemplary embodiment of the color tuning and light flux control device of FIG. 5 implemented on a display screen according to various exemplary embodiments of the disclosed subject matter; and

Figure 7 shows an example method for setting parameters of CCT, _Duv, and luminous flux of an LED array.

500: High-level schematic diagram

510: Desaturated LED array

511:「R」LED

513:「G」LED

515:「B」LED

520: Control switch

530: Controller box

531: Analog-to-digital converter (ADC)

550: Color tuning and luminous flux control device

551:CCT control device

553:D _uv control device

555:Flux control device

Claims (20)

A control device for color tuning a light emitting diode (LED) array, the device comprising: a correlated color temperature (CCT) control device, which is configured to be adjusted by an end user to a desired color temperature of an LED array, the CCT control device being further configured to generate an output signal corresponding to the desired color temperature; a Duv control device, which is configured to be adjusted by the end user to a desired Duv, wherein the Duv is a distance of the LED array from a black body line (BBL), the Duv control device being further configured to generate an output signal corresponding to the desired Duv from the BBL; a flux control device, which is configured to be adjusted by the end user to a desired luminous flux value of the LED array, the flux The control device is further configured to generate an output signal corresponding to the desired luminous flux value; and a controller box including an LED driving circuit for providing current to at least two colors of LEDs in the LED array, the controller box including at least one of an algorithm or a lookup table (LUT) and configured to receive the output signals corresponding to the desired color temperature, the desired Duv and the desired luminous flux value and make a determination about which of the at least two colors of LEDs receives the current based on a monotonic correlation between the output signals from the CCT control device, the Duv control device and the flux control device and the desired color temperature, the desired Duv and the desired luminous flux value, respectively, by the at least one of the algorithm or the LUT. A control device as claimed in claim 1, wherein the LED array comprises at least one LED for each of three selected colors of light in the visible light portion of the spectrum. The control device of claim 1, further comprising a multiplexer, the multiplexer including a plurality of control switches for providing the current to a selection of the LEDs in the LED array, the selection of the LEDs being at least A received CCT value based on one of the CCT output signals. The control device of claim 3, wherein the plurality of control switches are configured to periodically provide current to at least two colors of LEDs of the LED array within a predetermined amount of time, each time amount and current being based on the desired The color temperature, the desired Duv and the desired luminous flux value are associated with the at least two colors of the LED array. A control device as claimed in claim 1, wherein the LED array is a multi-color array comprising a plurality of LEDs of different colors. A control device as claimed in claim 5, wherein the LEDs of several colors in the LED multi-color array include at least one red LED, at least one green LED and at least one blue LED. A control device as claimed in claim 5, wherein the LED multicolor array includes at least one desaturated red LED, at least one desaturated green LED and at least one desaturated blue LED. A control device as claimed in claim 1, wherein the LED driving circuit further comprises a voltage-controlled current source, the voltage-controlled current source being configured to supply current to at least two LEDs in the LED array substantially simultaneously. A control device as claimed in claim 1, wherein the LED driver circuit is configured to supply a pulse width modulation (PWM) time-slicing signal to a hybrid power driver circuit of selected LEDs in the LED array, the selected LEDs being at least partially based on the desired color temperature. A control device as claimed in claim 1, wherein each of the CCT control device, the Duv control device and the flux control device comprises a 0V to 10V dimmer device. The control device of claim 1, wherein each of the CCT control device, the Duv control device and the flux control device includes a voltage divider. The control device of claim 1, wherein each of the CCT control device, the Duv control device and the flux control device includes a channel in a touch screen display. The control device of claim 1, wherein the at least one of the algorithm or the LUT is used simultaneously, such that the algorithm is configured to correlate at least one of the output signals, and the LUT configured to correlate with at least one other of the output signals. The control device of claim 13, wherein the algorithm is configured to correlate the output signals from the CCT control device and the Duv control device, and the LUT is configured to correlate the output from the flux control device signal. A controllable lighting device, comprising: an LED array having at least one desaturated red LED, at least one desaturated green LED and at least one desaturated blue LED; and a color adjustment and luminous flux control device, comprising: a correlated color temperature (CCT) control device, which is configured to be adjusted by an end user to a desired color temperature of the LED array, the CCT control device is further configured to generate an output signal corresponding to the desired color temperature; a Duv control device, which is configured to be adjusted by the end user to a desired Duv, wherein the Duv is a distance of the LED array from a black body line (BBL), the Duv controller The device is further configured to generate an output signal corresponding to the desired Duv; and a flux control device configured to be adjusted by the end user to a desired luminous flux value of the LED array, the flux control device is further configured to generate an output signal corresponding to the desired luminous flux value, and the desired color temperature, the desired Duv and the desired luminous flux value provided by the LED array are determined by at least one of an algorithm or a lookup table (LUT) based on a monotonic correlation between the output signals from the CCT control device, the Duv control device and the flux control device and the desired color temperature, the desired Duv and the desired luminous flux value, respectively. A controllable lighting device as claimed in claim 15, wherein the desired Duv is configured to adjust an overall color shift of the LED array along an isothermal CCT line corresponding to the desired color temperature. The controllable lighting device of claim 15, further comprising a controller box, the controller box including the desaturated red LED, the desaturated green LED and the desaturated blue LED in the LED array. LED driver circuit for at least one of the two color LEDs, the controller box is Configured to receive the output signals corresponding to the desired color temperature, the desired Duv, and the desired luminous flux value and make a determination as to which of the at least two colors of LEDs receives the current. A controllable lighting device as claimed in claim 15, wherein the LED array has a color rendering index (CRI) value greater than about 90. A controllable lighting device as claimed in claim 15, wherein the LED array having the at least one desaturated red LED, the at least one desaturated green LED and the at least one desaturated blue LED is configured to have a color temperature range from about 2700K to about 6500K. A method for setting parameters of a multi-color LED array, the method comprising: using an algorithm or a lookup table for each of a correlated color temperature (CCT) output signal, a Duv output signal and a flux output signal At least one of (LUT) makes the CCT output signal, the Duv output signal and the flux output signal monotonically related to a color temperature value, a Duv and a luminous flux value respectively, where the Duv is distanced from a black body line (BBL) a distance of a value; sending each of the correlated color temperature value, the correlated Duv, and the correlated luminous flux value to a controller for controlling the color temperature and intensity level of the multi-color LED array; and controlling the amount of current delivered to one of at least two colors of LEDs in the multi-color LED array.