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105results about How to "Stable light output" patented technology
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Current-mode direct-drive inverter
InactiveUS20050162098A1Increased operating lifeStable light outputElectroluminescent light sourcesSemiconductor lamp usageOutput transformerTime-sharing
An efficient and flexible current-mode driver delivers power to one or more light sources in a backlight system. In one application, the current-mode driver is configured as an inverter with an input current regulator, a non-resonant polarity-switching network, and a closely-coupled output transformer. The input current regulator can output a regulated current source in a variety of programmable wave shapes. The current-mode driver may further include a rectifier circuit and a second polarity-switching network between the closely-coupled output transformer and a lamp load. In another application, the current-mode driver delivers power to a plurality of light sources in substantially one polarity by providing a regulated current to a network of time-sharing semiconductor switches coupled in series with different light sources coupled across each semiconductor switch.
Owner:POLARIS POWERLED TECH LLC
Lamp current control using profile synthesizer
InactiveUS20050156539A1Increased operating lifeStable light outputElectroluminescent light sourcesSemiconductor lamp usageOutput transformerWave shape
An efficient and flexible current-mode driver delivers power to one or more light sources in a backlight system. In one application, the current-mode driver is configured as an inverter with an input current regulator, a non-resonant polarity-switching network, and a closely-coupled output transformer. The input current regulator can output a regulated current source in a variety of programmable wave shapes. The current-mode driver may further include a rectifier circuit and a second polarity-switching network between the closely-coupled output transformer and a lamp load. In another application, the current-mode driver delivers power to a plurality of light sources in substantially one polarity by providing a regulated current to a network of time-sharing semiconductor switches coupled in series with different light sources coupled across each semiconductor switch.
Owner:POLARIS POWERLED TECH LLC
Method and apparatus to drive LED arrays using time sharing technique
ActiveUS20050156536A1Increased operating lifeStable light outputElectroluminescent light sourcesSemiconductor lamp usageCurrent regulatorTime-sharing
An efficient and flexible current-mode driver delivers power to one or more light sources in a backlight system. In one application, the current-mode driver is configured as an inverter with an input current regulator, a non-resonant polarity-switching network, and a closely-coupled output transformer. The input current regulator can output a regulated current source in a variety of programmable wave shapes. The current-mode driver may further include a rectifier circuit and a second polarity-switching network between the closely-coupled output transformer and a lamp load. In another application, the current-mode driver delivers power to a plurality of light sources in substantially one polarity by providing a regulated current to a network of time-sharing semiconductor switches coupled in series with different light sources coupled across each semiconductor switch.
Owner:POLARIS POWERLED TECH LLC
Inverter with two switching stages for driving lamp
InactiveUS20050156540A1Increased operating lifeStable light outputElectroluminescent light sourcesSemiconductor lamp usageTime-sharingCurrent regulator
An efficient and flexible current-mode driver delivers power to one or more light sources in a backlight system. In one application, the current-mode driver is configured as an inverter with an input current regulator, a non-resonant polarity-switching network, and a closely-coupled output transformer. The input current regulator can output a regulated current source in a variety of programmable wave shapes. The current-mode driver may further include a rectifier circuit and a second polarity-switching network between the closely-coupled output transformer and a lamp load. In another application, the current-mode driver delivers power to a plurality of light sources in substantially one polarity by providing a regulated current to a network of time-sharing semiconductor switches coupled in series with different light sources coupled across each semiconductor switch.
Owner:POLARIS POWERLED TECH LLC
High intensity discharge lamp control
InactiveUS7385360B2Easy to operateSmall and inexpensive componentElectric light circuit arrangementGas discharge lamp usageConstant powerTRIAC
A controller 5 for a high intensity discharge lamp 4 includes a primary ballast for providing a primary current to the lamp 4, and a current injector which in the case shown comprises a control ballast 8 and a switch 9 (e.g. a triac) controlled by a control unit 12. The current injector injects a secondary current into the lamp 4 that is less than the primary current and can be varied by the control unit 12, e.g. by varying the amount of time within an a.c. cycle that the control ballast 8 is switched into the circuit. The controller 5 allows the lamp 4 to be controlled, for example, to operate at a constant power (variable light output) or at a constant light output (variable power).
Owner:THE ACTIVE REACTOR
Device and method for testing performance of blue light-emitting diode (LED) excitation fluorescent powder
ActiveCN103308499AAvoid wastingImprove the ability to capture lightFluorescence/phosphorescenceTest performanceSpectrograph
The invention discloses a device and method for testing performance of blue light-emitting diode (LED) excitation fluorescent powder and relates to fluorescent powder. The invention provides a device and method for testing performance of blue LED excitation fluorescent powder based on an integrating sphere. The testing device is provided with a fixing base, an integrating sphere, a light outlet barrel, a blue LED light source, a TEC temperature control clamp, a constant current source, a cosine collector, a spectrograph, a computer, a baffle and a standard white board. An LED with the advantages of adjustable spectrum parameters and stable illumination serves as the excitation light source, the light rays reflected by the fluorescent powder are completely collected through the characteristic that the integrating sphere device is closed, a set of fluorescent powder performance measurement system with high applicability is provided, and important luminous performance indexes, such a luminous efficacy, external quantum efficiency and light conversion efficiency, of the fluorescent powder under the actual working conditions can be conveniently and accurately measured and analyzed; meanwhile, the LED excitation light source can be flexibly replaced in the system so as to meet the requirements of different fluorescent powder on different excitation light sources, and the system has good extension performance.
Owner:XIAMEN UNIV
System and method for trace species detection using cavity attenuated phase shift spectroscopy with an incoherent light source
ActiveUS7301639B1Maximise couplingStable light outputColor/spectral properties measurementsBroadband absorptionSpectroscopy
This invention provides a system and method that enables the use of incoherent light sources, such as light emitting diodes, to provide for the detection of gaseous species which exhibit broadband absorption features (e.g., nitrogen dioxide and the halogen gases). The light emitting diode (LED) is an ideal light source for such an arrangement in that it can be modulated at high frequencies (allowing for omission of external modulation equipment) and provides sufficient illumination within a reasonably narrow wavelength band as compared to, for instance, an incandescent light source. A further advantage of a LED as a light source compared to alternatives such as a gas discharge or arc lamp is that the light output of the LED is highly stable, limited by the stability of the current source used to drive it. Use of a confocal or near-confocal resonant optical cavity maximizes coupling of the light source to the cavity.
Owner:AERODYNE RES
Dye auto-polymerized thin film random laser and preparation method thereof
The invention discloses a dye auto-polymerized thin film random laser. The dye auto-polymerized thin film random laser comprises external pump light and a thin film sample, wherein the thin film sample consists of a glass negative and a PDMS thin film; the glass negative and the PDMS thin film together form a leakage waveguide structure; and the PDMS thin film contains an auto-aggregated dye micro-nano crystal which is formed by auto aggregation of PM597 dye molecules. The invention furthermore discloses a preparation method of the dye auto-polymerized thin film random laser. According to the dye auto-polymerized thin film random laser, the low-concentration dye molecules are low in energy of self-absorption loss, so that the threshold value of the random laser is reduced and then the energy loss of the pump light is reduced; the solubility of the dye molecules change and the dye molecules aggregate to form the micro-nano crystal which serves as a scattering medium and a gain medium in a random laser outgoing process, so that the preparation method of the random laser is simplified; and the thin film random laser is low in threshold value and simple in preparation process.
Owner:SOUTHEAST UNIV
Light-emitting diode lamp
InactiveCN101865372AFlexible and diverse lighting distributionEfficient heat dissipationPoint-like light sourceElectric circuit arrangementsLight guideEngineering
Owner:FU ZHUN PRECISION IND SHENZHEN +1
Image display device
ActiveUS20090244407A1Loss of intensityStable light outputTelevision system detailsColor television detailsPhysicsLight scan
An image display device includes an optical scanning part, a drive control part which supplies an electric current to lasers, and a light detecting part. The drive control part supplies an electric current to the lasers while changing a current value at two points or more when a scanning position of the light scanned by the optical scanning part is at a predetermined position outside an effective scanning range. Based on intensity of an inspection-use light detected by the light detecting part, current-light emitting quantity characteristics of the lasers are calculated, and electric currents supplied to the lasers are adjusted based on a result of the calculation.
Owner:BROTHER KOGYO KK
Light-emitting diode (LED) lamp
InactiveCN101986001AImprove cooling efficiencyTo achieve the effect of thinningPlanar light sourcesPoint-like light sourceWorking fluidLight-emitting diode
The invention relates to a light-emitting diode (LED) lamp, which comprises a radiating part, an optical part and an electrical part, wherein the radiating part comprises a heat exchanging loop device and a communicating pipe radiator arranged on the top of the radiating part; a heat exchanging loop device is internally provided with a sealed first cavity, and a second cavity the top of which is open is formed on the top of the heat exchanging loop device; a capillary structure is distributed on the inner wall of the first cavity and is filled with working fluid; the first cavity is internally provided with a heat insulation piece; the communicating pipe radiator comprises at least one communicating pipe and a plurality of fins on the communicating pipe; the tops of natural heat exchanging loop devices at two ends of the communicating pipe are inserted into the first cavity and are communicated with the first cavity; the optical part comprises an LED light source arranged on the heat absorption surface at the bottom of the heat exchanging loop device; and the electrical part comprises a circuit board connected with the LED light source.
Owner:FU ZHUN PRECISION IND SHENZHEN +1
Optical engine structure with same substrate
ActiveCN103353065AImprove matchGood structural thermal conductivityPoint-like light sourceElectric circuit arrangementsAlternating currentMaterials science
The invention relates to an optical engine structure with a same substrate. The optical engine structure comprises the substrate, wherein LED light sources and LED constant current drivers are integrated on the substrate, and the LED constant current drivers are electrically connected with the LED light sources, and are used for converting the input DC or AC into steady-flow current to be supplied for the LED light sources to enable the LED light sources to emit illumination light after the electro-optical conversion is completed. According to the structure, the LED constant current driver as well as LED chips or lamp beads are integrated on the substrate, forming a standardized design of the LED light sources is facilitated, moreover, the matching of the LED constant current drivers and the LED chips is excellent, stable light source output can be formed, the improvement of the light efficiency can be facilitated, and the structure is excellent in thermal conduction, and has high voltage breakdown resistance performance.
Owner:上海晶擎能源科技有限公司
Control method and apparatus for implementing long-term maintained light strength by high power LED road lamp
InactiveCN101478850AExtended service lifeStable outputElectric light circuit arrangementEnergy saving control techniquesLuminous intensityClosed loop
The invention belongs to the field of high-power LED street lamp technology, concretely relating to a control method and a device for realizing long service life light intensity of a high-power light emitting diode street lamp. The invention has an adoption of closed-loop digital control; output light of LED is maintained to be strong in the whole service life span; and light decay thereof is compensated, thus guaranteeing a satisfactory luminous intensity in the service period of the street lamp; meanwhile, the service life of the LED street lamp can be prolonged. Concretely, optical signal output by the LED is detected, amplified, and converted by the device; the signal is filtered and judged and false signals are removed. In turn, light output of the lamp is regulated according to the light decay size obtained by calculation. The control method and a device for realizing long service life light intensity of a high-power light emitting diode street lamp also comprises a method for judging expiration of the service life of the lamp and sending out warning signal to an upper system at the expiration of the service life.
Owner:FUDAN UNIV
Alternating current LED light-emitting device
InactiveCN102468413AEasy to produceLow costPoint-like light sourceElectric circuit arrangementsManufacturing technologyEngineering
The invention relates to an alternating current LED light-emitting device, belonging to the LED manufacture technology field. The invention is aimed at solving a stroboscopic problem under alternating current power supply with low cost and problems of poor heat radiation and the like caused by microchip integration. A technical scheme of the present invention is as follows: an LED light-emitting unit comprises an LED chip and light-emitting material capable of emitting light under excitation of the LED chip, the LED light-emitting unit is characterized in that: an light-emitting life of the light-emitting material is 1 to 100 ms, the LED chip is the LED chip only comprising an light-emitting PN knot, and the LED light-emitting unit employs alternating current with frequency which is not larger than 100 Hertz for driving. The LED light-emitting device does not use a present alternating current LED chip which is integrated by a plurality of microcrystallites but uses a traditional single PN knot LED chip, fluctuation of luminance is not large in an alternating current period, the stroboscopic problem caused by an alternating current power supply is solved, production is simple, and cost is low.
Owner:SICHUAN SUNFOR LIGHT +1
Light-emitting diode lamp
InactiveCN101943335AHigh secondary coldnessImprove cooling efficiencyPoint-like light sourceSemiconductor/solid-state device detailsWorking fluidHeat resistance
Owner:FU ZHUN PRECISION IND SHENZHEN +1
Ridge-stripe semiconductor laser
InactiveUS7564884B1Made smallImprove featuresLaser detailsLaser optical resonator constructionActive layerLaminated composites
A laminated composite includes: a 1st-conductive-type cladding layer laid on a substrate; an active layer laid on the 1st-conductive-type cladding layer; and a ridge-stripe 2nd-conductive-type cladding layer laid on the active layer. A pair of films is disposed at the end faces of the laminated composite so as to oppose each other along the lamination direction. The paired films are formed to have different spectral reflectances from each other. The resonator structure is formed with the laminated composite and the paired films. When, in the length direction of the resonator, a side with one of the paired films which has a smaller spectral reflectance is the forward side and a side with the other film having a larger spectral reflectance is the backward side, the laminated composite is structured so that the optical confinement factor becomes smaller on the forward side than on the backward side.
Owner:PANASONIC CORP
LED light fitting and light engine thereof
InactiveCN101749570AImprove cooling efficiencyImprove uniform cooling efficiencyPoint-like light sourceSemiconductor/solid-state device detailsEvaporationEngineering
The invention relates to an LED light fitting and a light engine thereof; the LED light fitting comprises an optical part, an electrical part and a heat dissipation part, wherein the optical part comprises an LED light source and a light-emitting channel; the electrical part comprises a protecting cover and a circuit board; the heat dissipation part comprises a radiator and at least one heat pipe which are arranged between the protecting cover and the optical part; the radiator comprises a ring-shaped radiating base, a plurality of fins which are distributed on the outer surface of the radiating base in a radial way, and a heat absorbing plate positioned on the radiating base close to one end of the optical part; the radiating base is internally provided with a cavity body provided with an opening towards one end of the protecting cover; the LED light source is in thermal contact with the outer surface of the heat absorbing plate facing the optical part; and the heat pipe is arranged inside the cavity body of the radiating base and comprises an evaporation section and a condensation section, wherein the evaporation section is in thermal contact with the inner surface of the heat absorbing plate facing the electrical part, and the condensation section is in thermal contact with the inner surface of the radiating base.
Owner:FU ZHUN PRECISION IND SHENZHEN +1
Light-emitting diode lamp and light engine thereof
InactiveCN101769458AStable light outputHigh light efficiencyPoint-like light sourceElectric circuit arrangementsWorking fluidEngineering
Owner:FU ZHUN PRECISION IND SHENZHEN +1
Semiconductor electro-absorption optical modulator, semiconductor electro-absorption optical modulator integrated laser, optical transmitter module and optical module
ActiveUS20050275920A1Increase lengthEfficient in operationLaser detailsNanoopticsOperating temperatureOptical modulator
This invention provides an optical transmitter module and an optical module using an EA modulator capable of realizing stable ACER regardless of operating temperature without using a control mechanism for maintaining temperature of the EA modulator constant. In the EA modulator, optical waveguides formed of a multi-layered film are formed on a substrate, an electrical signal is applied to the optical waveguides in a direction vertical to the substrate, and the input light absorption amount is changed to control the amount of output light. Also, a plurality of p-side electrodes electrically separated from each other for applying an electrical signal to the active layer optical waveguides are arranged on optical axes of active layer optical waveguides. The length of optical waveguides to which the electrical signal is applied is changed by controlling the number of p-side electrodes to which the electrical signal is applied in accordance with temperature.
Owner:LUMENTUM JAPAN INC
Nitride semiconductor light emitting device having electrode electrically separated into at least two regions
ActiveUS7199398B2Favorable self pulsation characteristics without thermal hysteresisStable light outputLaser detailsSolid-state devicesActive layerLight emitting device
A nitride semiconductor light emitting device includes at least a substrate, an active layer formed of a nitride semiconductor containing mainly In and Ga, a p-electrode and an n-electrode. At least one of the p-electrode and n-electrode is electrically separated into at least two regions.
Owner:SHARP FUKUYAMA LASER CO LTD
Semiconductor laser element having InGaAs compressive-strained quantum-well active layer
InactiveUS20050201440A1Enhanced efficiencySuppress heat generationOptical wave guidanceLaser optical resonator constructionPhysicsBlocking layer
In a semiconductor laser element, a lower cladding layer, a lower optical waveguide layer, an InGaAs compressive-strain quantum-well active layer, an upper optical waveguide layer, and an upper cladding layer are formed in this order in a stripe-shaped region on a substrate. A current-blocking layer is formed on both sides of the compressive-strain quantum-well active layer so that the compressive-strain quantum-well active layer is sandwiched between two portions of the current-blocking layer, and trenches extending along the direction of the laser resonator are formed through the current-blocking layer. Instead of providing the trenches, the widths of the layers formed above the substrate are reduced so as to form a ridge structure.
Owner:FUJIFILM HLDG CORP +1
Driving circuit and projector
InactiveCN101621872AStable light outputGuaranteed service lifeProjectorsElectric light circuit arrangementCapacitanceVoltage reference
The invention relates to a driving circuit which comprises a reference voltage circuit and a clock circuit, the reference voltage circuit and the clock circuit are connected onto the driving chip and comprise a first transistor and a second transistor, the output end of the driving chip is connected with the input end of the first transistor, the output end of the first transistor is connected with a voltage reduction circuit, the two ends of a capacitance of the voltage reduction circuit are connected with the two output ends of the second transistor, the other end of the capacitance is back fed to the driving chip, the two output ends of the second transistor are connected with a load, the input end of the second transistor is connected with a pulse-width circuit, the invention also relates to a projector comprising the driving circuit.
Owner:HISENSE VISUAL TECH CO LTD
Display device
InactiveCN103221871AStable light outputStatic indicating devicesInstrument arrangements/adaptationsDriving currentPower flow
Owner:NIPPON SEIKI CO LTD
Yellow light afterglow material and preparation method thereof as well as LED illuminating device using same
InactiveUS9045689B2Maintain relatively stableStable light outputSolid-state devicesLuminescent compositionsReducing atmosphereRaw material
Owner:SICHUAN SUNFOR LIGHT +1
Large-space disinfection device
InactiveCN106705282AAchieve decompositionAchieve deodorizationLighting and heating apparatusSpace heating and ventilation detailsPower controllerDisseminated disease
The invention relates to the technical field of air purification, in particular to a large-space disinfection device. The large-space disinfection device comprises an outer frame of the disinfection device. A fan is arranged in the center in the outer frame. The two sides of the fan are both provided with purification and disinfection modules. Each purification and disinfection module is composed of two sets of photocatalyst nets and an LED ultraviolet disinfection module arranged between the two sets of photocatalyst nets. An air inlet or an air outlet are formed in one side of the outer frame. An air outlet or an air inlet are formed in the other side of the outer frame. A filtering screen is arranged on the position of the air inlet or the air outlet. A power source controller and a control panel are arranged in the outer frame. The large-space disinfection device has the function of preventing the transmission diseases of an air system pipeline, the quality of working and living environment is improved, the purification and disinfection efficiency is high, the energy consumption is small, the wind resistance is small, and the large-space disinfection device has the great use and popularization value.
Owner:KUNSHAN BOERFA NEW MATERIAL TECH CO LTD
Control method and apparatus for implementing long-term maintained light strength by high power LED tunnel lamp
InactiveCN101478851ASatisfactory illuminationStable light outputElectric light circuit arrangementEnergy saving control techniquesLuminous intensityClosed loop
The invention belongs to the field of high-power LED tunnel lamp technology, concretely relating to a control method and a device for realizing long service life light intensity of a high-power light emitting diode tunnel lamp. The invention has an adoption of closed-loop digital control; output light of LED is maintained to be strong in the whole service life span; and light decay thereof is compensated, thus guaranteeing a satisfactory luminous intensity in the service period of the tunnel lamp; meanwhile, the service life of the LED tunnel lamp can be prolonged. Concretely, optical signal output by the LED is detected, amplified, and converted by the device; the signal is filtered and judged and false signals are removed. In turn, light output of the lamp is regulated according to the light decay size obtained by calculation. The control method and a device for realizing long service life light intensity of a high-power light emitting diode tunnel lamp also comprises a method for judging expiration of the service life of the lamp and sending out warning signal to an upper system at the expiration of the service life.
Owner:FUDAN UNIV
Main unit structure of digital control laser cutting machine tool
InactiveCN101301724AImprove stabilityHigh strengthLarge fixed membersLaser beam welding apparatusNumerical controlLaser cutting
The invention discloses a host machine structure of a numerical control cutting machine in the field of laser cutting machines, comprising a machine body, a laser, a gantry beam, a movable crossbeam and a cutting head; the front side and the rear side of the machine body are provided with a supporting frame which is vertically arranged; the gantry beam is arranged between the upper sides of two supporting frames; when the laser emits the laser, the laser is transmitted to the cutting head; two ends of the gantry beam are fixedly connected with corresponding supporting frames respectively; the movable crossbeam which can move along the length direction of the gantry beam is suspended at the lower side of the gantry beam; the movable crossbeam and the gantry beam are vertically arranged in space; the cutting head which can move along the length direction of the movable crossbeam is suspended at the lower side of the movable crossbeam. The device leads the gantry beam to be fixedly connected with the supporting frame, reinforces the strength of the machine tool, and improves the stability of the machine tool; the middle driving of the movable crossbeam effectively reduces the vibration, leads the cutting head to realize the high-speed movement, and improves the cutting speed. The host machine structure can be used for the cutting of numerical control laser.
Owner:JIANGSU JINFANGYUAN CNC MACHINE CO LTD
LED lamp
InactiveCN102003635AStable light outputReliable electrical connectionPoint-like light sourceElongate light sourcesLight guideEngineering
The invention discloses an LED (light emitting diode) lamp which comprises a radiating part, an optical part and an electric part. The radiating part is provided with a radiating piece; and the optical part comprises an LED light source arranged on the radiating piece and a light guide cover which covers the LED light source inside. The electric part comprises a shell, a circuit board arranged in the shell and a lamp holder. The shell comprises a bottom plate and an annular side wall extending toward the radiating part and the optical part from the periphery of the bottom plate, and is connected with the radiating part and the optical part through the side wall. The lamp holder is arranged at the outer end of the bottom plate of the shell and comprises a conductive sleeve and a conductive column axially inserted into the conductive sleeve. The lamp holder is pivoted with the shell through the conductive column. Mutually-cooperating direction adjusting structures are arranged between the lamp holder and the shell so as to adjust the light emission direction of the LED lamp.
Owner:FU ZHUN PRECISION IND SHENZHEN +1
Quantum dot-wrapped phase-change paraffin microcapsule, LED device, and preparation methods of phase-change paraffin microcapsule and LED device
PendingCN110591688AStable light outputUniform light outputMaterial nanotechnologyHeat-exchange elementsParaffin waxMethacrylic acid copolymer
The invention belongs to the technical field of packaging preparation of light-emitting diode (LED) luminescent materials, and relates to a quantum dot wrapped phase-change paraffin microcapsule, an LED device and preparation methods of the phase-change paraffin microcapsule and the LED device. The quantum dot wrapped phase-change paraffin microcapsule comprises quantum dots, phase-change paraffinand methyl methacrylate-methacrylic acid copolymer shell material, wherein the quantum dots are dispersed and wrapped in the phase-change paraffin which is used as a spherical core of the microcapsule, and the methyl methacrylate-methacrylic acid copolymer outer shell coats the outer surface of the phase-change paraffin wax in a spherical shell shape. The LED device which contains the quantum dot-wrapped phase-change paraffin microcapsule comprises LED lamp beads and a colloid fluorescent coating, wherein the colloid fluorescent coating is doped with the quantum dot-wrapped phase-change paraffin microcapsule, and the colloid fluorescent coating coats light-emitting cup openings of the LED lamp beads. According to the invention, paraffin wax in a liquid state is encapsulated through microcapsules, so that the problem of insufficient scattering performance of quantum dots is solved by optimizing scattering; the surface area is increased through microencapsulation, and heat absorption iscarried out by phase change of the paraffin wax, so that the load of heat dissipation of LED is reduced.
Owner:SOUTH CHINA UNIV OF TECH
Light emitting unit arrangement and control system and method thereof
ActiveUS8159155B2Stable light outputReduce distractionsElectrical apparatusElectroluminescent light sourcesControl systemEngineering
The present invention relates to a control system (12) for controlling the light output of a light emitting unit (10), which light emitting unit comprises at least one light emitting diode (LED) (14) and is adapted to emit light of at least one color, the control system comprising: a sensor unit (18) adapted to detect the light output of the light emitting unit and provide a corresponding feedback signal; and a control unit (22) adapted to control the light output of the light emitting unit based on a comparison between the feedback signal and a corresponding reference signal representing a desired light output, in order to provide an improved light output, wherein the control unit is further adapted to: determine a random switching period; determine on-time(s) for the LED(s) within the random switching period for providing the improved light output; and control energizing of the LED(s) according to the determined period and on-time(s). The present invention also relates to an LED light emitting unit arrangement, and a method for controlling the light output of an LED light emitting unit.
Owner:SIGNIFY HLDG BV
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