The optical structures and luminous properties of the light source device composed of blue LEDs and YAG phosphor were examined by using optical simulation. Results showed that the reflection-type light source device had high luminous flux over 1.5 times more than the transmission-type light source device. This suggests that using light reflected from phosphor is an effective way to obtain high output from light sources composed of LEDs and phosphor.
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Yamada et al. (2002) studied this question.