US3644785A - Illumination arrangement for recording and/or reproduction in color - Google Patents

Illumination arrangement for recording and/or reproduction in color Download PDF

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US3644785A
US3644785A US863553A US3644785DA US3644785A US 3644785 A US3644785 A US 3644785A US 863553 A US863553 A US 863553A US 3644785D A US3644785D A US 3644785DA US 3644785 A US3644785 A US 3644785A
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lamp
voltage
color temperature
illumination apparatus
varying
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Sven O Jarmar
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SVERIGES RADIO AB
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SVERIGES RADIO AB
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    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B27/00—Photographic printing apparatus
    • G03B27/72—Controlling or varying light intensity, spectral composition, or exposure time in photographic printing apparatus
    • G03B27/73—Controlling exposure by variation of spectral composition, e.g. multicolor printers
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B39/00—Circuit arrangements or apparatus for operating incandescent light sources
    • H05B39/04—Controlling
    • H05B39/041—Controlling the light-intensity of the source
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps

Definitions

  • ..H05b 41/39 device includes a first lamp and a second, smaller, lamp, the [58] Field of Search ..315/152, 153, 154, 296, 297, lamps being coupled such that a change in the color tempera- 315/293; 355/3 5 37 70 33 ture in one direction of a first lamp is compensated for by a change in the color temperature of a second lamp, the change [56] References Cited in the color temperature of the second lamp being such in its direction and amount, to compensate for the change in color UNITED STATES PATENTS temperature of the first lamp.
  • This variation in color distribution within the used light may be compensated for by a change of the sensitivity of the recording apparatus for different colors.
  • this simple method is for practical reasons not available, because one cannot repeatedly change film in a camera so that the used film will be of the correct chemically optical composition, and also one cannot work with suitable adjustment filters, nor can one during a recording for television change the amplification of the three basic color amplifiers, because the changes in light intensity which occur will usually happen too often, too quickly, and too unexpectedly.
  • color temperature which is rather difficult to define but which is often used in the art.
  • a typical temperature of the incandescent wire in a lamp will be about 3,000 K, At this temperature the lamp will give off a light, which has a predetermined spectral composition, which is often understood to be completely white, although this is certainly far from correct. If one decreases the voltage, then the temperature of the incandescent wire will also decrease, and simultaneously the color of the incandescent wire is changed, or, as one could also express it, the gravity point of the illumination given off is displaced in a direction towards red.
  • the present invention now refers to an illumination arrangement, by means of which one may control the color intensity and the illumination by changing the voltage without thereby changing the color temperature to a further extent than a change within the allowed limits of tolerance.
  • At least two lamps are arranged in such a coupling that a change of the color temperature in one direction of one, essentially greater, lamp will be followed by a change of the color temperature of the other, essentially smaller, lamp, the latter change being so adapted as to its direction and amount, that it causes a compensation of the change of color temperature of the first-mentioned lamp.
  • the first-mentioned lamp will in the following be called the main lamp", whereas the latter lamp will be called the compensation lamp.
  • the invention is not limited to one single main lamp and one single compensation lamp, but that complete batteries of lamps of each kind may exist, and that the lamps in one and the same battery may not even necessarily be subjected to the same color temperature change.
  • the light fluxes from the two lamps should be combined into one single light beam.
  • suitable adaption between the light intensities of the two partial light beams one can then change the color of each partial light beam, so that in spite of the variations in the light intensity of the total light flux, its color, or as one used to say, its color temperature, will remain constant.
  • the color composition will remain constant at a state corresponding to the normal color temperature of the lamps, although the color temperature of the one lamp has increased and the color temperature of the other lamp has decreased.
  • one is here placed before an equilibrium relation with the desired color temperature as a reference point. A weak light flux in a greater temperature difference from the desired temperature thus may compensate as far as regards the color composition a smaller temperature difference in the other direction of a stronger light flux and vice versa.
  • FIG. I shows a normal diagram showing the variation of the color temperature as well as of the light flux with a change of the voltage of an incandescent lamp.
  • FIG. 2 shows a family of curves, indicating the spectral energy distribution in wavelength with the incandescent temperature as an arbitrary magnitude, measured as a function of the relative power
  • FIG. 3 shows one of the curves of the curve family according to FIG. 2 as well as the corresponding curve for a light flux composed of the flux from two lamps according to the invention, as the sum of the two partial light fluxes also shown in FIG. 3.
  • FIG. 4 shows a simple arrangement, by means of which one may with allowable approximation achieve a substantially constant color temperature independently of the variation in light flux
  • FIGS. 5 and 6 show a couple of different arrangements, more advanced for the same purpose, in block diagram.
  • FIG. 7 shows a complete diagram of a system of the last mentioned kind, in which, however, such means which are already commonly known have been shown in block diagram for simplification of the description.
  • FIG. 8 finally, shows an auxiliary diagram, which may be used for the calculation of the numerical values of the magnitudes contained in the diagram according to FIG. 7.
  • the diagram according to FIG. 1 refers to a known lamp having an incandescent wire, the normal temperature ofwhich was 3,000 K. at normal voltage.
  • the voltage scale runs along the horizontal axis and is divided into percent of the normal voltage.
  • the vertical axis is divided into percent of the normal value, viz regarding the curve A of the light flux and regarding the curve B of the color temperature. It is seen, that the one curve is concave upwardly, whereas the other one is strongly convex upwardly.
  • FIG. 4 A simple control device which can be used for a rather coarse manual control of the two lamps is shown in FIG. 4.
  • the main lamp is there indicated by 10 and the compensation lamp by 11. Both of these lamps are connected to the power mains 12 through one resistor 13 or 14, resp. These two resistors are variable and are controlled in common by means of one single control means, indicated by the dotted line 15.
  • the resistor 13 is arranged as a conventional rheostat, so that when its slider 16 is moved to the right in the drawing, then the resistance will increase and consequently the voltage remaining for the incandescent wire of the lamp 10 will decrease.
  • the main conductor is not connected to the terminal of the resistor 14 of the compensation lamp 11 but to an intermediate point 17.
  • the voltage is changed, for instance according to the curve 19 (FIG. 4), and simultaneously the light flux is changed according to the curve 20 (FIG. 4).
  • the corresponding curves for the function of the rheostat 14 are formed, as far asregards the voltage by the curve 21 and as far as regards the light flux by the curve 22.
  • the curve 22 is calculated in a way. which will be evident from the following, so that it will cause as far as possible compensation for the change of color temperature in the main lamp 10.
  • the main lamp 10 At full light the main lamp 10 will give a light flux corresponding to what was indicated in FIG. 2 by the value 10. Its color temperature then is equal to the working or normal color temperature, also indicated by the value 1.0. In this position, the compensation lamp 11 should be tuned to the working color temperature, and its light flux should suitably be in the order of magnitude about 0.1. If now the voltage of the main lamp 10 is decreased, then the light flux from this lamp will also decrease; simultaneously, however, also its color temperature is changed. For compensation of the decrease of the color temperature the compensation lamp 11 must get a higher voltage. Thereby the color temperature of this lamp does not only increase, but also its light flux.
  • the increase of light will not be as great as the decrease oflight flux from the main lamp, and the total light flux consequently becomes smaller.
  • the voltage of the main lamp 10 has been decreased such, that its color temperature has decreased to 0.9, the moment from the main lamp is the highest one. Consequently one will have to give the highest voltage to the compensation lamp in this state, corresponding to the position 23 on its rheostat 14.
  • the voltage of the compensation lamp must also be decreased for maintaining correct color composition, initially a little stronger but thereafter successively weaker.
  • the main lamp becomes completely dark, whereas the compensation lamp will still show a light radiation having a voltage and a color temperature which are identical withthe one which existed at the beginning of this operation.
  • FIG. 5 shows a further development of the basic idea of the arrangement according to the present invention as shown by means of FIG. 4.
  • voltage regulators have been placed between the mains 26 on the one hand and the main lamp 27 as well as the compensation lamp 28 on the other hand.
  • These voltage regulators in the simplest case, comprise controlled rectifiers, which are controlled in much the same way as the device according to FIG. 4, and therefore the different details have been provided with the same reference numerals.
  • a fixed resistor 29 has been connected in series with this rheostat, whereby it is possible to connect one terminal of the fixed resistor 29 to one main terminal and the other terminal to the two ends of the rheostat 14, whereby this will be subjected to a fixed current, which does not vary with the load of the compensation lamp 28, and whereby only the control voltage, without any substantial consumption of current, is derived from the slider 17 in the voltage regulator 25.
  • This arrangement may be further improved by causing the control voltage of the main lamp to determine in cascade coupling the control voltage of the compensation lamp 11, see FIG. 6. Also in this case the control voltage is obtained between the conductors 12, but the voltage required for feeding the lamp is obtained from the main 26.
  • Two voltage regulators are provided as was the case according to FIG. 5, but in this case only the voltage regulator 24 is controlled by means of the potentiometer 13 with the slider 16. The output voltage from the voltage regulator 24 is in this case conducted over the conductors 30 to a control unit of such character, that it will revert the control voltage between the conductors 30 to a control voltage of another value between a pair of conductors 32, running to the voltage regulator 25.
  • the control unit 31 is of such a character that the output voltage from the voltage regulator 24 will be reverted according to a nonlinear function in agreement with curve 33, the horizontal axis of which represents the input voltage over the conductors 30, and the vertical axis of which represents the output voltage over the conductors 32. Consequently, lamp 10 will be provided with a variable voltage, the value of which is determined by the voltage regulator 24 in agreement with the adjustment of the potentiometer 13, whereas simultaneously but in a controlled nonlinear relation, the lamp 11 is provided with a voltage, suitable for the compensation.
  • curve 33 in FIG. 6 or the curve 22 in FIG. 4, resp. has the shape, seen in the figures concerned.
  • the voltage of the compensation lamp 10 When the voltage of the lamp 10 is decreased, the color composition of the light produced by lamp 10 changes to a state, containing more red and less blue and violet.
  • the voltage of the compensation lamp should be increased, so that it shows a color, containing proportionally less red and more blue and violet. Initially one therefore increases the voltage of the compensation lamp, simultaneously as one decreases the the voltage of the main lamp. At a given decrease of the lamp, this will perhaps still show a stronger participation of red light, but simultaneously the light intensity of the main lamp has decreased so strongly, that the composition lamp will give off a continuously increasingly proportion of the total light flux.
  • the redish light of the main lamp would play a completely subordinated roll in comparison with the successively increased light intensity of the compensation lamp, and the total light flux would be overloaded by blue and violet light from the compensation lamp. It is therefore necessary, at a given value of the voltage relation between the two lamps, to decrease the voltage of the compensation lamp, so that this will have regained its normal color temperature at the moment, that the main lamp becomes completely dark, in other words the voltage of the compensation lamp should at this moment again have been decreased to its initial value. The light from the compensation lamp will therefore be the only remaining light.
  • FIG. 7 shows a complete wiring diagram of a system according to the invention, which principally agrees with the system shown in block diagram in FIG. 6.
  • the main for operation of the lamps is here indicated by 34. This main is an alternating current main of voltage of the main constant voltage.
  • each of the two lamps l0 and 11 there is a pair of controlled rectifiers 35 and 36 as well as 58 and 59, which are connected in the traditional way in pairs in parallel with each other but in opposite directions.
  • One of these rectifier pairs is controlled by means ofthe control unit 54, and the other rectifier pair is controlled by means of the control unit 60.
  • Such control units are priorly known for other purposes. They work in such a way, that a variation of the adjustment on the input sides of the control units causes a variation of the time displacement of ignition pulses, which are fed over the conductors 55 and 56 to the controlled rectifiers 35 and 36 or by means of corresponding conductors are fed to the controlled rectifiers 58 and 59.
  • the control procedure manifests itselfin the present case in a direct voltage, which is fed to the control unit 54 or 60, resp. over the conductor 53 or 63, resp.. controlling the magnitude of the output voltage obtained after the rectifiers 35 and 36 or 58 and 59, resp.
  • an equalization filter comprising a series inductance 38 with parallel condenser 39 and a series inductance 61 with parallel condenser 62, resp.
  • the potentiometer 50 is connected to the direct voltage between the terminals 51, which is exclusively used for a control voltage. It is without any decisive importance to this invention, how this control voltage is created, but it may suitably be created by rectification of the voltage in the main 34 after suitable down-transformation.
  • the slider 52 on the potentiometer 50 is connected to the conductor 53, and this conductor runs to the control unit 54 and in this way controls the voltage of the lamp 10.
  • the control unit 60 in this case is controlled by the voltage difference between the conductor 48, on the one hand, and a conductor 63, on the other hand.
  • the conductor 63 is fed from an amplifier 64, the one input side of which being formed by the conductor 48 and the other input side being formed by the conductor 65.
  • a protection resistor 66 is connected, and the other terminal of this resistor is connected through the conductor 83 to the contact point 84.
  • a further resistor 86 is interconnected, and the current through this resistor consequently determines the voltage which is fed to the one input circuit ofthe amplifier 64. In addition to the current thus running to the conductor of the amplifier 64.
  • Zener-diode unit 80 to the condenser 46, provided that the path through the Zener-diode unit 80 interconnected in the arrangement is open.
  • a further battery of Zener-diodes 70-74 is arranged, tuned for different ignition voltages.
  • Each of the Zener-diodes 70-74 is connected in series with a resistor 75-79.
  • Both of the Zener-diode batteries thus are composed by a number of Zener-diodes, connected mutually in parallel but tuned for different ignition voltages, each having its individual series resistor.
  • the voltage across the condensers45 and 46 When adjusting the potentiometer 50 to a lower voltage for the lamp 10, the voltage across the condensers45 and 46 also decreases. At full voltage on the lamp 10 the voltages across the condensers 45 and 46 is maximum, and all of the Zenerdiodesare then conductive. The current, which the voltage across the condenser 45 tries to press through resistor 86, then is equal to the current which the voltage across the condenser 46 tries to press through the same resistor, although in the op posite direction. These two components of current then compensate each other, and only the current from the terminals 51 will flow through the resistor 86.
  • FIG. 8 finally, indicates method for determining the curve according to which the voltage on the compensation lamp should vary, and for guidance in the dimensioning of the Zener-diodes as well as of their resistances.
  • the diagram is made in a so-called diagonale diagram.
  • the quadrant above the horizontal axis and at left of the vertical axis contains a curve G, which is plotted according to the properties of the main lamp 10.
  • the horizontal axis indicates the relative color temperature of said lamp, whereas the vertical axis indicates the relative light flux of the main lamp.
  • the light fiux of the auxiliary lamp is indicated by the curve I-I along the vertical axis in a direction downwardly, said light flux being measured in relation to the maximum value of the light flux of the main lamp, and the horizontal axis forms a direct continuation of the scale situated at left of the vertical axis.
  • the curve to be determined is situated in the quadrant, which is positioned under the horizontal axis but at the left of the vertical axis.
  • This curve I thus forms the locus of the light flux of the auxiliary lamp in relation to the color temperature of the main lamp, plotted in direction downwardly along the vertical axis.
  • a pure auxiliary curve which is required for the construction, is placed in the quadrant situated above horizontal axis and at the right of the vertical axis. This curve is indicated by J.
  • Illumination apparatus to be used in connection with picture recording or reproduction in color comprising a first lamp, a second lamp smaller than said first lamp, means for varying the color temperature of said first lamp, means for varying the color temperature of said second lamp, and coupling means for said color temperature varying means such that a change in the color temperature varying means such that a change in the color temperature of said first lamp causes a change in the color temperature of said second lamp, the latter change being sufficient indirection and amount to compensate for the former change.
  • Illumination apparatus according to claim 1 wherein the normal operating color temperature of said first lamp is substantially the same as that of said second lamp.
  • Illumination apparatus comprises means for changing voltage to change the light intensity thereof, wherein said means for varying the color temperature of said second lamp comprises means for changing voltages to change the light intensity thereof; said coupling means being arranged to increase the voltage to said second I lamp when the voltage to said first lamp is decreased from maximum until a point of at least approximate equilibrium between the color temperatures of these lamps is reached, and to thereafter decrease the voltage to said second lamp on further decrease in voltage to said first lamp.
  • Illumination apparatus comprises means for varying the voltage to said first lamp comprising a first variable resistor and said means for varying the color temperature of said second lamp comprises means for varying the voltage to said second lamp comprising a second variable resistor.
  • Illumination apparatus according to claim 4 wherein said first and second resistors each comprise slide means for varying the resistance value thereof, and wherein said coupling means comprises a member linking said slides.
  • said first and second lamps is substantially constant over the range of resistance values of said resistors.
  • Illumination apparatus according to claim 4 wherein said means for changing voltage of said first and second lamps each further comprises a voltage regulator electrically connected to said variable resistor and to said lamp.
  • Illumination apparatus comprises a first variable resistor
  • said means for changing the voltage to said second lamp comprises a control unit responsive to the output voltage of said first variable resistor to produce a con trol unit output voltage fed to said second lamp, the latter outputvoltage compensating for the color temperatures of said first lamp determined by the setting of said first variable resistor.
  • said means for changing the voltage to said first lamp further includes a voltage regulator controlled by the output voltage of said variable resistor
  • said means for changing the voltage of said second lamp further includes a voltage regulator controlled by the output voltage of said control unit.
  • Illumination apparatus wherein said control unit is supplied with direct current from a first voltage supply and wherein said first and second lamps are each supplied with alternating current from-a second voltage supply.
  • each of said voltage regulators comprises two controlled rectifiers connected in parallel in the line supplying current to its respective lamp, said rectifiers being connected in electrically opposite directions.
  • Illumination apparatus comprising a transformer, the primary winding of which is connected into the conductor supplying current from said voltage regulator to said first lamp, the secondary winding thereof being connected to a rectifier for feeding rectified voltage to said control unit.
  • Illumination apparatus according to claim 13 wherein the voltage from said secondary winding is connected to said control unit through a plurality of Zener rectifiers graded by means of ignition voltage resistors, the rectifier grading providing the correct characteristics for compensation of a change in the color temperature of said first lamp.
  • Illumination apparatus includes two secondary windings each being connected to one set of Zener-rectifiers along with control voltage controlled resistors one of said set of Zener rectifiers being intended to cause a rise of voltage to said second lamp required in the beginning of the control range, whereas the other set of Zener rectifiers is intended to cause the decrease of the voltage to said second lamp required at the end of the controlled range, said two sets of graded Zener rectifiers being for this purpose connected in directions electrically opposite to each other.
  • Illumination apparatus according to claim 15 further comprising an amplifier connected in the conduit between the Zener rectifiers and the control unit for said second lamp.
  • Illumination apparatus according to claim 13 wherein said rectifier comprises a double wave rectifier.
  • Illumination apparatus according to claim 17 wherein said rectifier comprises a Graetz-bridges.

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  • Physics & Mathematics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • General Physics & Mathematics (AREA)
  • Circuit Arrangement For Electric Light Sources In General (AREA)
  • Projection-Type Copiers In General (AREA)
  • Color Television Image Signal Generators (AREA)
US863553A 1968-10-09 1969-10-03 Illumination arrangement for recording and/or reproduction in color Expired - Lifetime US3644785A (en)

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SE13595/68A SE342966B (zh) 1968-10-09 1968-10-09

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JP (1) JPS5142491B1 (zh)
AT (1) AT297849B (zh)
BE (1) BE739994A (zh)
CH (1) CH512778A (zh)
DE (1) DE1950581C3 (zh)
DK (1) DK124780B (zh)
FR (1) FR2020201A1 (zh)
GB (1) GB1292314A (zh)
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Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3841752A (en) * 1972-08-18 1974-10-15 Fuji Xerox Co Ltd Light source for copying machine
US3984726A (en) * 1975-04-25 1976-10-05 Ppg Industries, Inc. Ultraviolet light system having means for maintaining constant intensity light profile
US4045664A (en) * 1971-09-04 1977-08-30 U.S. Philips Corporation Lighting fitting provided with at least two-low-pressure mercury vapor discharge lamps
US4408838A (en) * 1979-03-14 1983-10-11 Neal Factor System for the regulation of light for a sequential picture apparatus
EP0375289A2 (en) * 1988-12-20 1990-06-27 Strand Lighting Limited Electric lighting and power controllers therefor
US5237244A (en) * 1988-12-20 1993-08-17 Bertenshaw David R Electric lighting and power controllers therefor
US20040090191A1 (en) * 1997-08-26 2004-05-13 Color Kinetics, Incorporated Multicolored led lighting method and apparatus
US20040105261A1 (en) * 1997-12-17 2004-06-03 Color Kinetics, Incorporated Methods and apparatus for generating and modulating illumination conditions
US20050040774A1 (en) * 1999-11-18 2005-02-24 Color Kinetics, Inc. Methods and apparatus for generating and modulating white light illumination conditions
US20050041424A1 (en) * 1999-11-18 2005-02-24 Color Kinetics, Inc. Systems and methods for converting illumination
US20050151489A1 (en) * 1997-08-26 2005-07-14 Color Kinetics Incorporated Marketplace illumination methods and apparatus
US20050285547A1 (en) * 1997-08-26 2005-12-29 Color Kinetics Incorporated Light emitting diode based products
US20060076908A1 (en) * 2004-09-10 2006-04-13 Color Kinetics Incorporated Lighting zone control methods and apparatus
US7598686B2 (en) 1997-12-17 2009-10-06 Philips Solid-State Lighting Solutions, Inc. Organic light emitting diode methods and apparatus
CN114820385A (zh) * 2022-05-20 2022-07-29 河南科技学院 局部自适应的水下图像颜色校正方法

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JPS60126982U (ja) * 1984-02-06 1985-08-26 杉崎　則佳 プラグの引抜き具
DE3526590A1 (de) * 1985-07-25 1986-01-02 Zinnecker, Elisabeth, 7891 Lottstetten Verfahren und anordnung zur steuerung einer beleuchtungsanlage
DE19829270B4 (de) * 1997-07-02 2006-03-16 Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH Lampe
EP1492441B1 (en) * 2002-04-10 2013-04-03 Karl Storz Endoscopy-America, Inc. Apparatus and method for powering portable battery operated light sources
GB2421367B (en) 2004-12-20 2008-09-03 Stephen Bryce Hayes Lighting apparatus and method

Cited By (36)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4045664A (en) * 1971-09-04 1977-08-30 U.S. Philips Corporation Lighting fitting provided with at least two-low-pressure mercury vapor discharge lamps
US3841752A (en) * 1972-08-18 1974-10-15 Fuji Xerox Co Ltd Light source for copying machine
US3984726A (en) * 1975-04-25 1976-10-05 Ppg Industries, Inc. Ultraviolet light system having means for maintaining constant intensity light profile
US4408838A (en) * 1979-03-14 1983-10-11 Neal Factor System for the regulation of light for a sequential picture apparatus
EP0375289A2 (en) * 1988-12-20 1990-06-27 Strand Lighting Limited Electric lighting and power controllers therefor
EP0375289A3 (en) * 1988-12-20 1991-08-28 Strand Lighting Limited Electric lighting and power controllers therefor
US5237244A (en) * 1988-12-20 1993-08-17 Bertenshaw David R Electric lighting and power controllers therefor
US7453217B2 (en) 1997-08-26 2008-11-18 Philips Solid-State Lighting Solutions, Inc. Marketplace illumination methods and apparatus
US7161311B2 (en) 1997-08-26 2007-01-09 Color Kinetics Incorporated Multicolored LED lighting method and apparatus
US20040178751A1 (en) * 1997-08-26 2004-09-16 Color Kinetics, Incorporated Multicolored lighting method and apparatus
US7462997B2 (en) 1997-08-26 2008-12-09 Philips Solid-State Lighting Solutions, Inc. Multicolored LED lighting method and apparatus
US20040090191A1 (en) * 1997-08-26 2004-05-13 Color Kinetics, Incorporated Multicolored led lighting method and apparatus
US7274160B2 (en) 1997-08-26 2007-09-25 Color Kinetics Incorporated Multicolored lighting method and apparatus
US20050151489A1 (en) * 1997-08-26 2005-07-14 Color Kinetics Incorporated Marketplace illumination methods and apparatus
US20050285547A1 (en) * 1997-08-26 2005-12-29 Color Kinetics Incorporated Light emitting diode based products
US7161313B2 (en) 1997-08-26 2007-01-09 Color Kinetics Incorporated Light emitting diode based products
US20060012987A9 (en) * 1997-12-17 2006-01-19 Color Kinetics, Incorporated Methods and apparatus for generating and modulating illumination conditions
US20060109649A1 (en) * 1997-12-17 2006-05-25 Color Kinetics Incorporated Methods and apparatus for controlling a color temperature of lighting conditions
US20060152172A9 (en) * 1997-12-17 2006-07-13 Color Kinetics, Inc. Methods and apparatus for generating and modulating white light illumination conditions
US7598686B2 (en) 1997-12-17 2009-10-06 Philips Solid-State Lighting Solutions, Inc. Organic light emitting diode methods and apparatus
US7520634B2 (en) 1997-12-17 2009-04-21 Philips Solid-State Lighting Solutions, Inc. Methods and apparatus for controlling a color temperature of lighting conditions
US7387405B2 (en) 1997-12-17 2008-06-17 Philips Solid-State Lighting Solutions, Inc. Methods and apparatus for generating prescribed spectrums of light
US20040105261A1 (en) * 1997-12-17 2004-06-03 Color Kinetics, Incorporated Methods and apparatus for generating and modulating illumination conditions
US7350936B2 (en) 1999-11-18 2008-04-01 Philips Solid-State Lighting Solutions, Inc. Conventionally-shaped light bulbs employing white LEDs
US20050041424A1 (en) * 1999-11-18 2005-02-24 Color Kinetics, Inc. Systems and methods for converting illumination
US7255457B2 (en) 1999-11-18 2007-08-14 Color Kinetics Incorporated Methods and apparatus for generating and modulating illumination conditions
US20050040774A1 (en) * 1999-11-18 2005-02-24 Color Kinetics, Inc. Methods and apparatus for generating and modulating white light illumination conditions
US20050030744A1 (en) * 1999-11-18 2005-02-10 Color Kinetics, Incorporated Methods and apparatus for generating and modulating illumination conditions
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Also Published As

Publication number Publication date
DE1950581A1 (de) 1970-04-23
BE739994A (zh) 1970-03-16
DK124780B (da) 1972-11-20
NL6915277A (zh) 1970-04-13
SE342966B (zh) 1972-02-21
FR2020201A1 (zh) 1970-07-10
GB1292314A (en) 1972-10-11
NO125518B (zh) 1972-09-18
JPS5142491B1 (zh) 1976-11-16
CH512778A (de) 1971-09-15
AT297849B (de) 1972-04-10
DE1950581C3 (de) 1975-05-15
DE1950581B2 (de) 1974-09-19

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