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Maximum luminance prediction method for multichannel LED light sources under chromaticity constraints for tunable
Optics Express
|September 23, 2025
Summary
Determining maximum light output for multichannel LED light sources (MLLSs) is challenging due to color shifts. This study presents a prediction method integrating color and luminance models, achieving high accuracy for tunable lighting applications.
Area of Science:
- Optoelectronics
- Color Science
- Lighting Technology
Background:
- Multichannel light-emitting diode (LED) light sources (MLLSs) provide flexible tunable lighting for adjusting correlated color temperature (CCT) and luminance.
- Achieving maximum luminance at specific chromaticities with MLLSs is difficult due to nonlinearities and color shifts from individual LED channels.
Purpose of the Study:
- To develop and validate a prediction method for estimating the maximum achievable luminance of MLLSs at a target chromaticity.
- To overcome the challenge of color shifts induced by simple linear scaling of control signals in MLLSs.
Main Methods:
- A novel prediction method integrating a color prediction model and a luminance optimization model was developed.
- A constrained optimization algorithm based on differential evolution was employed to handle nonlinearities.
- The method was validated on two MLLSs (4-channel amplitude modulation and 8-channel pulse-width modulation) across various white-light chromaticities (2200 K to 6500 K).
Main Results:
- The prediction method demonstrated excellent accuracy in estimating maximum luminance and chromaticity.
- Mean relative luminance errors were 1.11% for MLLS1 and 0.88% for MLLS2.
- Mean CIE 1976 chromaticity differences were 1.07 × 10-3 for MLLS1 and 0.57 × 10-3 for MLLS2, comparable to the color prediction model's performance.
Conclusions:
- The proposed method accurately predicts the maximum luminance of MLLSs at specified chromaticities, accounting for nonlinearities.
- This approach enables precise control over tunable lighting systems, avoiding undesirable color shifts.
- The findings are significant for advanced lighting applications requiring accurate color and brightness control.
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