Determination of Optical Parameters in Quasi-Monochromatic LEDs for Implementation of Lighting Systems with Tunable Correlated Color Temperature

The paper proposes a new method for determining the optimal peak wavelengths of quasi-monochromatic LEDs, when they are combined with white broadband high-power LEDs in lighting systems with tunable correlated color temperature (CCT). Simulation of the resulting radiation spectrum was used to demonstrate the possibility to use the developed method in LED lighting systems with tunable parameters of the synthesized light. The study enables to determine the peak wavelengths of quasi-monochromatic LEDs (474 and 600 nm), which, when being combined with a basic white LED (Cree CMA 2550), allow controlling the widest CCT range. Quasi-monochromatic LEDs with particular optimal spectral parameters allow adjusting CCT within the range from 3098 up to 6712 K, while maintaining a high color rendering index (higher than 80) over the most part (3098 to 5600 K) of the regulation range.