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18 August 2010 Effects of color temperature and luminous efficiency for RGB LEDs mixing with tuning voltage
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Abstract
LEDs are already being used in monitors, and they have more recently appeared in plate displays. Therefore, this study investigated the effects of color temperature and luminous efficiency for RGB LEDs mixing with tuning voltage. The base voltages of red, green, and blue LEDs will be set up for the color temperature of 6500K(D65 white light). These results exhibited that changing the voltage of red LED had the broader color temperature from 2000 K to 16000 K and low luminous variation from 27 to 40 lm /W than green and blue LEDs. Though the green LED had the low luminous variation from 25 to 40 lm /W but the color temperature only tuned from 2500K to 7500K. In contrast, though the blue LED had large color temperature from 4000K to 19000K but the luminous efficiency had rapid variation from 20 to 40 lm /W. The green LED was suitable for fine-tuning color temperature from 2500K to 7500K. The blue LED had rapid variation of color temperature from 4000K to 19000K so it could only suitable for high-color temperature modulation. The color shifts (Δuv) of red and green LEDs were the same variation with color temperature but not for blue LED.
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Hsi-Chao Chen, Guo-Yang Wu, and Jun-Yu Lin "Effects of color temperature and luminous efficiency for RGB LEDs mixing with tuning voltage", Proc. SPIE 7784, Tenth International Conference on Solid State Lighting, 778418 (18 August 2010); https://doi.org/10.1117/12.859797
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