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Journal of Light & Visual Environment
Vol. 27 (2003) No. 2 P 70-74




The optical structures and luminous properties of light source devices composed of blue LEDs and YAG phosphor were examined using optical simulation. Results showed that the reflection-type light source device had a high luminous flux over 1.5 times greater than the transmission-type light source device. This suggests that using light reflected from the phosphor is an effective way of obtaining high output from light sources composed of LEDs and phosphor.

Copyright © 2003 The Illuminating Engineering Institute of Japan

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