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작성일 : 2020-11-03
작성자 : 김종오
Important determinants of selecting
outdoor lightings are color rendering index (CRI) and scotopic to photopic (S/P)
ratio of the lightings. The higher S/P ratio the better energy saving and eye
performance. In this study, CCT-tunable LED lightings were optimized and
fabricated by spectral combination of red, green, blue, and yellow LEDs. The measured
results of RGB LEDs provided S/P ratios of 1.55~2.58 and those of RGBY LEDs
gave 1.46~2.46 in the correlated color temperature (CCT) ranges of 2700 K and
6500K, with the CRI values over 80 at the same time.