Presented is a convenient and timesaving design method for illuminating light being used as a pint-sized searchlight usually,based on white light emitting diode(LED) source.The process of design is studied mostly in a...Presented is a convenient and timesaving design method for illuminating light being used as a pint-sized searchlight usually,based on white light emitting diode(LED) source.The process of design is studied mostly in advanced system analysis program(ASAP).The analyses on this kind of design method reveal the factors that would affect the luminous flux distribution of light,including the number of LED chips,the focus of reflecor and refractor,the corresponding position of reflector and refractor with the source.The zone cofficient method and point-by point method are discussed respectively to determine the LED source and the illuminace distribution of light.The desired parallel light output is gained after being optimized in ASAP at last.展开更多
One of the methods to derive white light from light emitting diodes(LEDs)is the multi-chip white LED technology,which mixes the light from red,green and blue LEDs.Introduced is an optimal algorithm for the spectrum de...One of the methods to derive white light from light emitting diodes(LEDs)is the multi-chip white LED technology,which mixes the light from red,green and blue LEDs.Introduced is an optimal algorithm for the spectrum design of the multi-chip white LEDs in this paper.It optimizes the selection of single color LEDs and drive current controlling,so that the multi-chip white LED achieves the target correlated color temperature(CCT),as well as high luminous efficacy and good color rendering.A CCT tunable LED light source with four high-power LEDs is realized based on the above optimal design.Test results show that it maintains satisfactory color rendering and stable luminous efficacy across the whole CCT tuning range.Finally,discussed are the design improvement and the prospect of the future applications of the CCT tunable LED light source.展开更多
文摘Presented is a convenient and timesaving design method for illuminating light being used as a pint-sized searchlight usually,based on white light emitting diode(LED) source.The process of design is studied mostly in advanced system analysis program(ASAP).The analyses on this kind of design method reveal the factors that would affect the luminous flux distribution of light,including the number of LED chips,the focus of reflecor and refractor,the corresponding position of reflector and refractor with the source.The zone cofficient method and point-by point method are discussed respectively to determine the LED source and the illuminace distribution of light.The desired parallel light output is gained after being optimized in ASAP at last.
基金National High Technology Research and Development(863) Programof China(2006AA03A173)
文摘One of the methods to derive white light from light emitting diodes(LEDs)is the multi-chip white LED technology,which mixes the light from red,green and blue LEDs.Introduced is an optimal algorithm for the spectrum design of the multi-chip white LEDs in this paper.It optimizes the selection of single color LEDs and drive current controlling,so that the multi-chip white LED achieves the target correlated color temperature(CCT),as well as high luminous efficacy and good color rendering.A CCT tunable LED light source with four high-power LEDs is realized based on the above optimal design.Test results show that it maintains satisfactory color rendering and stable luminous efficacy across the whole CCT tuning range.Finally,discussed are the design improvement and the prospect of the future applications of the CCT tunable LED light source.
