Abstract
We described a basic theory of multi-point light sources that comprise white light-emitting diode (LED) arrays for lighting applications. Evaluating the luminous intensity distribution is very important to understand the illuminance properties in the multi-point LED sources. We thoroughly studied each property of conventional white LEDs using blue LED excitation and a novel type of white LED using near ultraviolet (UV) LED excitation, making use of our theory. Individual quaternary multi-point light sources composed of orange, yellow, green and blue (OYGB) phosphors, combined with near UV LEDs were fabricated. A theoretical method using the radiation intensity distribution function was carried out to determine chromaticity and luminous properties of the light from these OYGB white LEDs under direct illumination. This shows that OYGB white LEDs have some characteristics that are superior to those of the conventional white LEDs.
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