The full spectrum refers to the spectrum curve that includes ultraviolet, visible, and infrared light in the spectrum, and the ratio of red, green, and blue in the visible part is similar to that of sunlight, and the color rendering index Ra is close to 100.
The spectrum of sunlight can be called the full spectrum, and the color temperature changes with the four seasons and the time of morning and evening. Therefore, the spectrum of the full spectrum lamp should change the color temperature successively with the change of time, and simulate the natural light environment in order to be more in line with the natural growth laws of organisms.
The continuous spectrum of solar radiation at noon on a sunny day, with a color temperature of 5000K, is divided into two parts: visible light and invisible light. The wavelength of visible light is 400-760 nm, and it is divided into 7 colors: red, orange, yellow, green, cyan, blue, and purple, which are concentrated as white light; there are two types of invisible light, infrared with wavelengths greater than 760 nm and ultraviolet rays with wavelengths of 290-400 nm.
The blue light spectrum in ordinary LEDs is relatively high, and it lacks violet, cyan, short-wave green, and long-wave red parts. At present, full-spectrum LEDs are realized by chips + phosphors. By adding purple chips or adding between the blue peak and the phosphor peak. Phosphors with wavelengths in the recessed region are used to complement the spectrum.
The color rendering ability of a light source to an object is called color rendering. The color rendering index of sunlight is defined as 100. The closer the color rendering index (Ra) value is to 100, the better the color rendering.
15 sample colors are used to evaluate the color rendering of the light source. The special color rendering R9 is an indicator of the reproduction quality of the vivid red color of the LED. The higher values ??of Ra and R9 are the performance of high-quality LEDs.
Compared with ordinary LEDs, full-spectrum LEDs have a more continuous spectrum and wider color gamut; the color rendering index Ra is greatly improved, closer to 100; the special color rendering index R9 can be as high as 90 or more.