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Proceedings Paper

Investigation of color temperature of high-power white LEDs array modulated by mixing of monochrome or bicolor LEDs
Author(s): Hsi-Chao Chen; Wei-Jhe Chen; Jia-Hao Jhou; Yuan-Jui Chang
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Paper Abstract

The proposal of the study was investigated the variation of color temperature in a high-power light-emitting diodes (HP-LEDs) array modulated by monochrome or bicolor LEDs for intelligent lighting. A 3 Watt white LED was used as the main light source of HP-LEDs and 3Watt red or yellow LEDs was used as the adjustment light source in a 3×3 square LEDs array. There are five LEDs array: 5W(white)+4R(red), 5W+4Y(yellow), 5W+3R+1Y, 5W+3Y+1R, and 5W+2R+2Y were assembled in the research for the investigation of color temperature. The experimental results exhibited that 5W+4R LEDs array had the broader range of color temperature from 8000 K to 2500 K than the short range of 5W+4Y LEDs array from 8000 K to 5000 K. In additional, the color temperature of 5W+2R+2Y LEDs array also could adjust broadened color temperature range from 8000 K to 3000 K and improve the steep status of color temperature of 5W+4R LEDs array. Simultaneously, the power saving model of 90% and 80% and failure model of 50% of white LEDs were adjusted the color temperature by red and yellow LEDs also be investigated. However, the 5W+2R+2Y LEDs array is a good choice for the color temperature adjustment in the application of LED lighting.

Paper Details

Date Published:
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Proc. SPIE 8835, LED-based Illumination Systems, 88350W; doi: 10.1117/12.2023029
Show Author Affiliations
Hsi-Chao Chen, National Yunlin Univ. of Science and Technology (Taiwan)
Wei-Jhe Chen, National Yunlin Univ. of Science and Technology (Taiwan)
Jia-Hao Jhou, National Yunlin Univ. of Science and Technology (Taiwan)
Yuan-Jui Chang, National Yunlin Univ. of Science and Technology (Taiwan)


Published in SPIE Proceedings Vol. 8835:
LED-based Illumination Systems
Jianzhong Jiao, Editor(s)

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