CN107270139B - Light emitting device and method for operating a light emitting device - Google Patents

Light emitting device and method for operating a light emitting device Download PDF

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CN107270139B
CN107270139B CN201710442177.0A CN201710442177A CN107270139B CN 107270139 B CN107270139 B CN 107270139B CN 201710442177 A CN201710442177 A CN 201710442177A CN 107270139 B CN107270139 B CN 107270139B
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light
temperature
light source
optical element
emitting device
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CN107270139A (en
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姚久琳
许明祺
廖本瑜
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Epistar Corp
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Epistar Corp
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21K—NON-ELECTRIC LIGHT SOURCES USING LUMINESCENCE; LIGHT SOURCES USING ELECTROCHEMILUMINESCENCE; LIGHT SOURCES USING CHARGES OF COMBUSTIBLE MATERIAL; LIGHT SOURCES USING SEMICONDUCTOR DEVICES AS LIGHT-GENERATING ELEMENTS; LIGHT SOURCES NOT OTHERWISE PROVIDED FOR
    • F21K9/00—Light sources using semiconductor devices as light-generating elements, e.g. using light-emitting diodes [LED] or lasers
    • F21K9/20—Light sources comprising attachment means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21K—NON-ELECTRIC LIGHT SOURCES USING LUMINESCENCE; LIGHT SOURCES USING ELECTROCHEMILUMINESCENCE; LIGHT SOURCES USING CHARGES OF COMBUSTIBLE MATERIAL; LIGHT SOURCES USING SEMICONDUCTOR DEVICES AS LIGHT-GENERATING ELEMENTS; LIGHT SOURCES NOT OTHERWISE PROVIDED FOR
    • F21K9/00—Light sources using semiconductor devices as light-generating elements, e.g. using light-emitting diodes [LED] or lasers
    • F21K9/60—Optical arrangements integrated in the light source, e.g. for improving the colour rendering index or the light extraction
    • F21K9/64—Optical arrangements integrated in the light source, e.g. for improving the colour rendering index or the light extraction using wavelength conversion means distinct or spaced from the light-generating element, e.g. a remote phosphor layer
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
    • F21Y2113/00—Combination of light sources
    • F21Y2113/10—Combination of light sources of different colours
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
    • F21Y2115/00—Light-generating elements of semiconductor light sources
    • F21Y2115/10—Light-emitting diodes [LED]

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Optics & Photonics (AREA)
  • General Engineering & Computer Science (AREA)
  • Led Device Packages (AREA)

Abstract

An embodiment of the invention discloses a light-emitting device, which comprises a first light source, a second light source and a control unit, wherein the first light source is set to emit first light at a first low temperature and a first high temperature and has a first heat and cold coefficient; a second light source, which is set to emit a second light at the first low temperature and the first high temperature and has a second heat-cooling coefficient larger than the first heat-cooling coefficient; and an optical element configured to be excited by the first light to generate a third light and to reach a second high temperature higher than the first high temperature under irradiation of the first light.

Description

Light emitting device and method for operating a light emitting device
The present application is a divisional application of an invention patent application having an application date of 2012, 08/31, an application number of 201210319939.5 and an invention name of "light emitting device".
Technical Field
The present invention relates to a lighting device, and more particularly, to a lighting device with less color temperature variation perception for users, such as a lighting device using light emitting diodes of various colors.
Background
There are several ways to form white Light using Light-Emitting diodes (LEDs). One is to use more than three Monochromatic (Monochromatic Color) light sources to produce white light, e.g., red, blue, and green leds. Another way is to mix two colored lights, e.g. blue and yellow, that are Complementary colors to each other (Complementary Color). Typically, blue light is generated by a nitride light emitting diode, and yellow light is generated by a phosphor excited by the blue light. White light produced by two complementary Color light sources generally has higher Luminous Efficiency (lumines Efficiency) but poorer Color Rendering Index (Color Rendering Index; CRI) than white light produced by three monochromatic light sources.
Color Rendering (Color Rendering) is a measure of the true Color of a light source in comparison to daylight. The light source with high color rendering index can present the real color of the object. Halogen lamps (Halogen lamps) and Incandescent bulbs (Incandescent bulbs) are currently among artificial light sources with better color rendering index, which can reach 100. The color rendering index of Fluorescent lamps (Fluorescent Light) is usually between 60 and 85. The color rendering index of white light generated by the blue light emitting diode and the yellow fluorescent powder only reaches about 70. Blue leds, when combined with two or more phosphors, such as yellow and red phosphors, can increase the color rendering index to about 80, but reduce the luminous efficiency by about 30%.
Disclosure of Invention
An embodiment of the present invention discloses a light emitting device, including: the light source emits first light at a first temperature; and an optical element excited by the first light to generate a second light, wherein the shortest distance between the optical element and the light source is D, and D is greater than 0, wherein the optical element can reach a second temperature higher than the first temperature under the irradiation of the first light.
One embodiment of the present invention discloses a method for operating a light emitting device, comprising: providing a light source capable of emitting a first light ray and an optical element, wherein the shortest distance between the light source and the optical element is D, and D is greater than 0; and the first light irradiates the optical element to generate second light until the temperatures of the light source and the optical element reach a steady state or a quasi-steady state, wherein when the temperature is the steady state or the quasi-steady state, the light source has a first temperature, the optical element has a second temperature, and the second temperature is higher than the first temperature.
An embodiment of the invention discloses a light-emitting device, which comprises a first light source, a second light source and a control unit, wherein the first light source is set to emit first light at a first low temperature and a first high temperature and has a first heat and cold coefficient; a second light source, which is set to emit a second light at the first low temperature and the first high temperature and has a second heat-cooling coefficient larger than the first heat-cooling coefficient; and an optical element configured to be excited by the first light to generate a third light and to reach a second high temperature higher than the first high temperature under irradiation of the first light.
In another embodiment of the present invention, the first light, the second light, and the third light can be mixed into a mixed light, the mixed light has a chromaticity coordinate difference (Δ x, Δ y) between the first low temperature and the first high temperature, and Δ y/Δ x is greater than-0.2.
In another embodiment of the present invention, the first light, the second light, and the third light can be mixed into a mixed light, the mixed light has a first chromaticity coordinate at the first low temperature and a second chromaticity coordinate at the first high temperature, and the first chromaticity coordinate and the second chromaticity coordinate are respectively located at two sides of the blackbody radiation curve.
In another embodiment of the present invention, the first light, the second light, and the third light can be mixed into a mixed light, the mixed light has a first chromaticity coordinate at the first low temperature and a second chromaticity coordinate at the first high temperature, and the first chromaticity coordinate and the second chromaticity coordinate are located on the same side of the blackbody radiation curve.
In another embodiment of the present invention, the first light, the second light, and the third light can be mixed into a mixed light, the mixed light has a first chromaticity coordinate at the first low temperature and a second chromaticity coordinate at the first high temperature, and a connection line of the first chromaticity coordinate and the second chromaticity coordinate is substantially parallel to the blackbody radiation curve.
In another embodiment of the present invention, the first light, the second light, and the third light can be mixed into a mixed light, and the mixed light has a first correlated color temperature at the first low temperature and a second correlated color temperature at the first high temperature, and the second correlated color temperature is greater than the first correlated color temperature.
In another embodiment of the present invention, the difference between the first high temperature and the second high temperature is between 30 ℃ and 40 ℃.
In another embodiment of the present invention, the first light comprises blue light, and the second light comprises red light.
In yet another embodiment of the present invention, the optical element comprises a wavelength converting material that can be disposed on the optical element and away from the second light source.
In another embodiment of the present invention, the optical element comprises a frustum.
Drawings
Fig. 1 is a configuration diagram illustrating a light emitting device according to an embodiment of the present invention;
fig. 2 illustrates a light emitting device according to still another embodiment of the present invention;
fig. 3 is a comparative example illustrating a light emitting device according to an embodiment of the present invention; and
fig. 4 illustrates a light emitting device according to still another embodiment of the present invention.
[ description of the reference numerals of the main elements ]
10 first light source 30c phosphor layer
20 second light source 100 light emitting device
30 light emitting device of optical element 200
30a recess 300 light emitting device
30b phosphor layer 400 light emitting device
30 b' phosphor layer
Detailed Description
The following description of the embodiments of the present invention is provided with reference to the drawings.
As shown in fig. 1, an embodiment of the invention discloses a light-emitting device 100, which at least includes a first light source 10, a second light source 20, and an optical element 30. The closest distance between the first light source 10 and the optical element 30 is D1, the closest distance between the second light source 20 and the optical element 30 is D2, and D1 and D2 may be equal or different. The optical element 30 may be a single structure or comprise several separate structures. One light source 10 can generate a first light L1, and the second light source 20 can generate a second light L2 different (all or part of different wavelengths) from the first light L1. The first light L1, the second light L2, or both can illuminate the optical element 30 (for example, the optical element 30 can cover the first light source 10, the second light source 20, or both), and the optical element 30 can generate at least one third light L3 different from the first light L1 or the second light L2. The first light L1 can generate the fourth light L4 if only mixed with the third light L3 (or not mixed, i.e., there is no fourth light L4 in the drawing). The first light L1, the second light L2, and the third light L3 (or the third light L3 and the fourth light L4) can be mixed at a spatial location to form a fifth light L5. The spatial position may be outside the optical element 30 and inside the light-emitting device 100, or outside the light-emitting device 100. The number, size and position of the light emitting devices 100, the first light sources 10, the second light sources 20 and the optical elements 30 in fig. 1 can be exemplified, but the invention is not limited thereto.
For example, the light emitting device 100 is a light source, such as a lamp or a tube; the first light source 10 is a light emitting diode, and the first light L1 is blue light (not limited to a monochromatic light source, but also includes a light source with a blue light band in the spectrum, the following is the same); the second light source 20 is another light emitting diode, and the second light L2 is red light (not limited to a monochromatic light source, but also includes a light source with a red light band in the spectrum, the following is the same); the third light L3 is yellow light (not limited to monochromatic light, but also includes light with yellow band in spectrum, the same applies below); the fourth light L4 is a higher color temperature white light (e.g., a Correlated Color Temperature (CCT) of 4000K or more); the fifth light ray L5 is a lower color temperature white light (e.g., a correlated color temperature of 4000K or less). The optical element 30 may include a phosphor that is excited by blue light and generates yellow light, such as Yttrium Aluminum Garnet (YAG) phosphor, Silicate-based phosphor, Terbium Aluminum Garnet (TAG) phosphor, Oxynitride (oxy) phosphor. The phosphors listed in this specification each have their operating characteristics, such as yttrium aluminum garnet type phosphor having a better luminous efficiency at a high temperature (e.g., above 100 ℃), and oxynitride type phosphor having a better luminous efficiency at a medium-low temperature (e.g., below 100 ℃). Therefore, when the light emitting device 100 is used in a high temperature operating environment, yttrium aluminum garnet type phosphor may be selected; if the material is used in a medium-low temperature operating environment, the nitrogen oxide fluorescent powder can be selected. However, the above selection proposals are not absolute and can be adjusted according to the design requirements.
For example, the light emitting device 100 is a light source, such as a lamp or a tube; the first light source 10 is a light emitting diode, and the first light L1 is blue light; the second light source 20 is another light emitting diode, and the second light L2 is red light; the three light beams L3 are green light (not limited to monochromatic light sources, but also include light sources with a green light band in the spectrum, the same applies below); the fourth light L4 is a cyan-green light (blue; not limited to a monochromatic light source, but also includes a light source including a cyan-green light band in the spectrum, the same applies below); the fifth light L5 is white light. The optical element 30 may include phosphors that can be excited by blue light to generate green light, such as silicate phosphors, yttrium Aluminum garnet phosphors, luag (lutetium Aluminum garnet), and beta-SiAlON. Specific chemical compositions are exemplified as follows: (Sr, Ba)2SiO4:Eu2+、SrGa2S4:Eu2+、Y2SiO5:Tb、CeMgAl11O19:Tb、Zn2SiO4:Mn、LaPo4:Ce,Tb、Y3Al5O12:Tb、Y2O2S:Tb,Dy、BaMgAl11O17:Eu,Mn、GdMgZnB5O10:Ce,Tb、Gd2O2S:Tb,Dy。
The first light source 10 may have a first Hot/Cold Factor (Hot/Cold Factor), and the second light source 20 may have a second Hot/Cold Factor different from the first Hot/Cold Factor. The so-called Hot/Cold Factor (or Temperature Coefficient, TC) is the ratio of the luminous flux of the light source at high Temperature divided by the luminous flux at low Temperature. The luminous flux at high temperature is less than that at low temperature, the heat and cold coefficient is less than 1, otherwise, the heat and cold coefficient is greater than 1. The larger the heat and cold coefficient, the smaller the magnitude of the light flux or luminous efficiency decay due to temperature. For example, if the heat-cooling coefficient of a light emitting diode is X and the luminous flux at 25 ℃ is taken as a reference value, the luminous flux at 100 ℃ will only remain (100X)%, i.e., (100-X)%, i.e., the reduction of the luminous flux. If the input power is not changed, the larger the decrease of the luminous flux, the worse the luminous efficiency of the light source.
In another embodiment, the light emitting device 100 may be at a first temperature T1And a second temperature T2Emitting light at a second temperature T2Above the first temperature T1(at T)1And T2May or may not emit light) and the first light source 10 has a first heat and cold coefficient HC1The second light source 20 has a second heat-cooling coefficient HC2And HC1>HC2. The first light L1 and the second light L2 are at T1The luminous flux ratio is FR1In T at2The ratio of time to luminous flux is FR2Since the thermal attenuation of the second light L2 is more significant than that of the first light L1, FR is caused1<FR2. At T1When the correlated color temperature of the fifth light ray L5 (which can be a mixed light of pure L1 and L2, or a mixed light of L1, L2 and L3) is CT1At T2, the correlated color temperature of the fifth light ray L5 is CT2Since the mixing ratio of the first light L1 and the second light L2 is at T1And T2Different (FR)1≠FR2) So that CT is1And CT2The same is true. Therefore, the heat and cold coefficients may also affect the color temperature of the mixed light.
The operating temperature of the light emitting device 100 tends to increase as the usage time increases. If the light emitted from the light emitting device 100 includes color lights generated by a plurality of light sources with different thermal and cold coefficients, the color temperature of the light emitted from the light emitting device 100 will change due to the change of the operating temperature. In order to alleviate the color temperature variation of the mixed light at high and low temperatures or achieve the desired color temperature design requirement, the following embodiments are proposed in the present application.
In an embodiment of the invention, the closest distance between the first light source 10 and the optical element 30 is D1, the closest distance between the second light source 20 and the optical element 30 is D2, D1 and D2 may be equal to or different from each other, and neither D1 nor D2 is equal to zero. The optical element 30 comprises a wavelength converting material 40 that converts the first light ray L1 into a third light ray L3. The wavelength conversion material 40 is, for example, a phosphor (a specific material is as described above), a dye, a semiconductor, or the like. The wavelength conversion material 40 has a specific conversion efficiency, and converts the excitation light (e.g., the first light L1) into the emission light (e.g., the third light L3) in a certain proportion, while the excitation light that is not converted into the emission light may leave the wavelength conversion material 40 or be converted into heat, which increases the temperature of the optical element 30. If the temperature of the wavelength converting material 40 or the optical element 30 is higher than the temperature of the light source, keeping it away from the light source or separating both with a transparent insulating material may also reduce the heat transferred to the light source. Once the temperature of the light source is reduced, the influence of the heat and cold coefficients on the color temperature can be relieved. On the contrary, if the temperature of the optical element 30 is lower than the temperature of the light source, the optical element 30 is close to the light source to absorb the heat of the light source, so as to reduce the temperature of the light source and also alleviate the influence of the heat and cold coefficients on the color temperature.
As shown in the light emitting device 200 illustrated in fig. 2, the first light source 10 is a blue led, the second light source 20 is a red led, and the thermal-cooling coefficient of the first light source 10 is greater than that of the second light source 20. The optical element 30 is a frustum (frustum) of an inverted cone (reversible cone) and has a recess 30a therein, and a phosphor layer 30b is disposed in the recess 30 a. The first light source 10 and the second light source 20 may be selectively disposed on a carrier 50. The carrier 50 is, for example, a Printed Circuit Board (PCB), a ceramic substrate, a metal substrate, a plastic substrate, glass, a silicon substrate, or the like. The optical element 30 and the carrier 50 may be filled with other materials, such as glue, heat conductive material, light scattering material, etc., besides the light emitting diode. In one embodiment, the first light source 10 and the second light source 20 start to operate from room temperature until the temperature of the light source and the optical element 30 reaches a Steady State (Steady State) or a Quasi-Steady State (Quasi-Steady State).
For example, the optical element 30 is a frustum as shown in fig. 2, and has an upper diameter (Dt) of about 17 mm, a lower diameter (Db) of about 8 mm, and a height H of about 5 mm (i.e., the distance between the phosphor layer 30a and the first and second light sources 10 and 20 is about 5 mm). Initially, the first light source 10 and the second light source 20 operate from about 25 ℃ and emit blue light and red light, respectively, the blue light excites the optical device 30 to generate yellow light, and the blue light, the red light, and the yellow light combine to form a low color temperature white light having a correlated color temperature of about 2500K, CIE (x1, y1)initialThe chromaticity coordinates were about (0.4733, 0.4047). After a few minutes, the temperature does not rise appreciably. At this time, the temperature of the first light source 10 and the second light source 20 is about 70 ℃ to 90 ℃, and the temperature of the optical element 30 is about 100 ℃ to 130 ℃, so the temperature of the first light source 10 and the second light source 20 is about 30 ℃ to 40 ℃ lower than that of the optical element 30. At this steady state temperature, blue, red and yellow light can mix to form a high color temperature white light with a correlated color temperature of about 3000K, CIE (x1, y1)stableThe chromaticity coordinate is about (0.4395, 0.4104). That is, the correlated color temperature difference of white light from low temperature to high temperature is about 500K, the chromaticity coordinates (Δ x1, Δ y1) change about (-0.0339,0.0057), and Δ y 1/. DELTA.x 1 is about-0.17. Since Δ x1 is much larger than Δ y1(0 ≧ Δ y 1/[ Δ x1 ≧ 0.2), the slope of the chromaticity coordinate change between low and high temperatures is relatively slow, and CIE (x1, y1)initialAnd CIE (x1, y1)stableThe connecting lines of the chromaticity coordinates may be parallel or approximately parallel to the black body radiation curve. That is, the low and high temperature chromaticity coordinates are connected on one side of the blackbody radiation curve or cross the blackbody radiation curve with a smaller slope. In this example, CIE (x1, y1)initialCIE (x1, y1) below the black body raystableAbove the line of black body radiation.
In contrast, if the optical element 30 is not used, the phosphor is directly coated on the first light source 10 and the second light source 20 (i.e., the phosphor is not far from the light sources), but other conditions are not changed, CIE (x2, y2) of the low color temperature white lightinitialChromaticity coordinate of about (0.4806,0.43), CIE (x2, y2) for high color temperature white lightstableThe chromaticity coordinates are about (0.4531,0.4504), and although the correlated color temperature difference of white light is about 500K, the variation of chromaticity coordinates (Δ x2, Δ y2) is about (-0.0275,0.0204), and Δ y 2/. DELTA.x 2 is about-0.74. The slope of the chromaticity coordinate change is steep between the low temperature and the high temperature, and the moving line segment of the chromaticity coordinate or the extension line thereof can cross the blackbody radiation curve. And since Δ y2 is much larger than Δ y1(Δ y 2/. DELTA.y 1 equals 3.58), the shift of (x2, y2) to the green region (520nm to 560nm) in chromaticity coordinates is larger than (x1, y 1). Since the human eye is more sensitive to green light, the more the amount of change in green light, the more the human eye can perceive the change in light color or color temperature.
In addition, since the optical element 30 is far away from the light source, the light source is also far away from the heat source, so as to reduce the temperature, thereby improving the light emitting efficiency. For example, as in the design of fig. 2, the light emitting efficiency of the light emitting device 200 is reduced by 24% from low temperature to high temperature. However, if the optical element 30 is covered after the phosphor layer 30 b' directly covers the first light source 10 and the second light source 20, the light emitting efficiency of the light emitting device 300 will be reduced by 27%, as shown in fig. 3.
Thus, by adopting the configuration or method of the above embodiment of the present invention, the sensitivity of human eyes to color temperature change can be reduced, and the luminous efficiency of the light source can be improved.
In another embodiment of the present invention, as shown in fig. 4, the light emitting device 400 has the first light source 10 being a blue led and the second light source 20 being a red led. The optical element 30 is an inverted conical frustum with a recess 30a therein, and a phosphor layer 30c is provided in the recess 30a and on a side surface of the frustum. The first light source 10 and the second light source 20 may be selectively disposed on a carrier 50. The carrier 50 is, for example, a printed circuit board, a ceramic substrate, a metal substrate, a plastic substrate, glass, a silicon substrate, or the like. The optical element 30 and the carrier 50 may be filled with other materials, such as glue, heat conductive material, light scattering material, etc., besides the light emitting diode. Since the upper and side surfaces of the optical element 30 are covered with the phosphor layer 30c, the color above and below the light emitting device 100 can be more uniform. For example, chromaticity coordinates (Δ u ',. DELTA.v') of the light-emitting device 400400About (0.010,0.014), and of light-emitting device 200 (Du ', Dv')200About (0.014, 0.023). In addition, if a scattering material, such as TiO, is added to the optical element 30, the phosphor layer 30c, or both2It also helps to form a light field with more uniform color.
While the drawings and descriptions herein have been described in connection with particular embodiments, it will be understood that elements, implementations, design criteria, and technical principles disclosed or disclosed in the various embodiments may be arbitrarily referenced, exchanged, matched, coordinated, or combined as required, unless expressly conflicting, contradictory, or otherwise difficult to achieve in common.
Although the invention has been described with reference to particular embodiments, it is not intended to limit the scope, sequence, or use of the materials or process steps. Various modifications and alterations of this invention can be made without departing from the spirit and scope of this invention.

Claims (10)

1. A light emitting device, comprising:
the light source emits first light at a first temperature; and
an optical element excited by the first light to generate a second light, wherein the shortest distance between the optical element and the light source is D, and D is greater than 0; and
a wavelength converting material disposed on the optical element and remote from the light source,
wherein the wavelength conversion material can reach a second temperature under the irradiation of the first light,
wherein if the second temperature is higher than the first temperature, the optical element and the light source are far away from each other; if the second temperature is lower than the first temperature, the optical element is close to the light source to absorb heat.
2. The light emitting device of claim 1, wherein the first temperature is between 70 ℃ and 90 ℃.
3. The light emitting device of claim 1, wherein the second temperature is between 100 ℃ and 130 ℃.
4. The lighting device of claim 1, wherein the lighting device comprises a light bulb or a light tube.
5. The light-emitting device of claim 1, wherein the first light and the second light are mixed to generate white light or cyan-green light.
6. The light emitting device of claim 1, wherein the light emitting device further comprises a transparent insulating material separating the wavelength converting material from the light source.
7. The light emitting device of claim 1, wherein the light emitting device has a higher color temperature at a higher temperature.
8. The light emitting device of claim 1, wherein the optical element has a width greater than the light source.
9. A method of operating a light emitting device, comprising:
providing a light source capable of emitting a first light ray and an optical element, wherein the shortest distance between the light source and the optical element is D, and D is greater than 0, the optical element comprises a wavelength conversion material, and the wavelength conversion material is arranged on the optical element and is far away from the light source; and
the first light irradiates the optical element to generate a second light until the temperatures of the light source and the optical element reach a steady state or a quasi-steady state,
wherein, when the temperature is a steady state or a quasi steady state, the light source has a first temperature, the optical element has a second temperature,
wherein if the second temperature is higher than the first temperature, the optical element and the light source are far away from each other; if the second temperature is lower than the first temperature, the optical element is close to the light source to absorb heat.
10. The method of claim 9, wherein measuring the light emitting device at an initial state obtains a first color temperature, measuring the light emitting device at the steady state or the pseudo-steady state obtains a second color temperature, the second color temperature being higher than the first color temperature.
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