No.10（2015）4.Development of new LED luminaire improved color appearance No.2

Toshihide Iwanaga, Hirotaka Nakamura, Shirou Shirai, Shigeru Ichihara, Masami Ishihara

  It is important to consider the color appearance of objects to which the LED luminaire lights up in the spectral distribution design. However, it has been known that maximizing the effect of color appearance caused to decrease the luminous efficacy. In this study, we report both a spectral distribution design method to realize higher luminous efficacy without losing color appearance effect, and a trial LED lamp developed based on the method. With respect to the spectral distribution by this method, the luminous efficacy improvement of approximately 16% and 25% has been achieved for (1) daylight approximation and for (2) increasing the chroma of the color red respectively compared to the lamp without efficacy consideration.

Keywords
LED, Color appearance, CIECAM02, Spectral distribution design, Luminous efficacy

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