研究目的
To present the results from the study of the spatial color uniformity of a specially developed luminaire for dynamic tunable white lighting at different color temperatures, as a base for future research on Human Centric Lighting.
研究成果
The luminaire shows good spatial color uniformity between -75° and +75° in horizontal and vertical directions, with efficacies between 138 lm/W and 147 lm/W. Uniformity degrades beyond ±75° due to LED characteristics. These findings provide a foundation for future research on Human Centric Lighting systems, emphasizing the need for careful study of spatial color temperature variations during dimming for human wellbeing applications.
研究不足
The color uniformity is broken in the angular space between ±75° and ±90° due to measurement difficulties and constructional characteristics of LEDs. The study is limited to one type of luminaire and specific color temperatures, and results may vary with different luminaire designs.
1：Experimental Design and Method Selection:
The study involved measuring light and color distributions of a linear luminaire designed for dynamic tunable white lighting at color temperatures of 3000K, 4000K, and 6500K, using standard methodologies for photometry and colorimetry.
2：Sample Selection and Data Sources:
A specially constructed luminaire with PMMA diffuser and LED modules of 3000K and 6500K color temperatures, each with 2200lm luminous flux, was used. The 4000K temperature was achieved by mixing the two via a controller.
3：List of Experimental Equipment and Materials:
Luminaire with PMMA diffuser, LED modules (3000K and 6500K), DALI Prof 4-RTC controller, LMT colorimeter, automated goniophotometer, and equipment meeting BDS EN 13032 standards.
4：Experimental Procedures and Operational Workflow:
Measurements were conducted according to BDS EN 13032-4:2015, ensuring constant ambient temperature and stable power supply. Light distribution curves and color uniformity were measured using the goniophotometer and colorimeter.
5：Data Analysis Methods:
Results were analyzed for light efficacy, luminous flux, and spatial color uniformity, with comparisons made to standards and prior studies.
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