Research on lighting system based on LED current and temperature spectrum model

Changes in current and temperature can affect the spectral distribution of the LED, which in turn affects the visual and non-visual parameters of the light source. In this paper, starting from the spectral model based on the distribution of photon energy levels in the LED chip luminescent material, the current and temperature model was established for the RGBY four-color LED. The R-square of the spectral fitting could reach 0.99. On this basis, the genetic algorithm (GA) was used to optimize the circadian rhythm factor and luminous efficiency with multiple objectives. When the illuminance was 300 lx, 8 sets of visual parameters (color rendering index and blue light hazard efficiency) and non-visual parameters ( circadian rhythm stimulus) were designed to verify the feasibility of this model. Then, the relationship between two non visual parameters and temperature was explored. The results show that the circadian rhythm factors increased with the increase of temperature, but the circadian rhythm stimulus decreased with the increase of temperature. The reason for this situation was that the two parameters were differently affected by the illuminance. After compensating the illuminance of the light source, it was found that the two non-visual parameters both increased with the increase of temperature, and the two showed a certain positive correlation. This research started from the perspective of the light source spectrum and provided a reference for the consideration of non-visual effects in the design of LED lighting sources.