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High bright and white light emitting diodes(LEDs) were fabricated. White LEDs are the fourth color made for commercial use following blue, green and red. White LEDs typically have the efficacy of 10 lm/W and the color temperature of 3000K-10000K. This new technology was achieved by combining blue InGaN LED and YAG phosphor. Compared with incandescent lamps, advantages such as wide color variation, life beyond 10000hr, no burn-out, reduced sensitivity to variation and little heat generation are expected.
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Bando et al. (1998) studied this question.
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