Illumination characteristics of lighting array using 10 candela-class white LEDs under AC 100V operation

Abstract We describe the basic illumination characteristics of lighting source using 10 cd-class InGaN-based white LED (an efficacy of 15 lm/W) under a driving condition of AC 100 V. 697 white LEDs with series connections were arrayed on a glass epoxy substrate and were driven by adjusting a current of less than 20 mA. The temperature dependence of both the emission spectrum and intensity was measured. The white LED array indicates two distinct electroluminescence peaks at 465 and 555 nm at room temperature, which are related to the radiative recombinations from the InGaN MQW blue LED and from the YAG : Ce phosphor, respectively. We have obtained a maximum luminous intensity of about 30 000 lx and a maximum luminance of 95 000 cd/m2 from the LED array.