Looking at the change in optical characteristics according to ambient temperature, a wavelength shift occurs as the ambient temperature increases (generally 0.1 to 0.3 nm/K), and in the case of high-efficiency devices, B(-0.05%/oC) => W(-0.3%/ The amount of light decreases in the following order: oC) => G(-0.35%/oC) => R(-0.83%/oC) => A(-1.05%/oC). Controlling operating conditions in product design is important. Since the cost is high, it can be said that it is desirable to use devices or products that are optimal for the operating conditions to be used.

The importance of the electro-optical characteristic evaluation function according to ambient temperature, for which our company holds an original patent, is emerging both domestically and internationally. Due to the characteristics of LED devices in addition to the existing optical characteristics, the change in light amount compared to the ambient temperature according to the ambient temperature is based on a cubic linear equation. However, unlike individual products, the tendency varies depending on the heat dissipation design of the array, module, or light source, so it is necessary to evaluate the operating temperature dependence of the actual product to improve quality. The graph below shows the relationship between temperature and electro-optical characteristics.