Color Temperature Tunable White-Light LED Cluster with Extrahigh Color Rendering Index

Color Temperature Tunable White-Light LED Cluster with Extrahigh Color Rendering Index

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The correlated color temperature (CCT) tunable white-light LED hbl5266ca cluster with extrahigh color rendering property has been found by simulation and fabricated, which consists of three WW LEDs (CCT = 3183 K), one red LED (634.1 nm), one green LED (513.9 nm), and one blue LED (456.2 nm).

The experimental results show that this cluster can realize the CCT tunable white-lights with a color rendering index (CRI) above 93, special CRI R9 for strong red above 90, average value of the special CRIs of R9 to R12 for the here four saturated colors (red, yellow, green, and blue) above 83, and luminous efficacies above 70 lm/W at CCTs of 2719 K to 6497 K.