Shifting Views on Chromaticity Maintenance
Wednesday, February 14, 2018: 2:15 PM - 2:45 PM
Chromaticity shifts (aka, color shifts) are nothing new in the lighting industry, but the long lifetimes of LED-based sources are placing greater focus on the chromaticity maintenance of SSL products. Chromaticity and lumen maintenance are coupled degradation mechanisms for LED devices, but knowledge of the lumen maintenance characteristics has been at the forefront for the past decade. Fortunately, the understanding of chromaticity shifts in SSL devices (including lamps and luminaires) has increased significantly in the last 3 years. Factors at the LED package, module, and device levels are now known to significantly impact chromaticity shifts in a predictable manner. This presentation will focus on these recent findings on LED chromaticity maintenance, including new insights into projecting chromaticity behavior and suggestions for managing chromaticity shifts. These recent findings have significant implications for standard SSL products as well as LED-based lighting devices (e.g., tunable white sources and horticultural lighting) targeting specific applications.