What is a full spectrum LED?
Full spectrum refers to the spectrum curve containing ultraviolet light, visible light, and infrared light, and the ratio of red, green and blue in the visible light 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 seasons and morning and evening. Therefore, the spectrum of the full spectrum lamp should change the color temperature with time to simulate the natural light environment, so as to be more in line with the natural growth law 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. Visible light has a wavelength of 400~760 nm, divided into 7 colors of red, orange, yellow, green, cyan, blue, and purple, which are concentrated into white light; two kinds of invisible light, infrared light with a wavelength greater than 760nm and ultraviolet light with a wavelength of 290-400nm.
Full-spectrum LEDs should simulate the 5000K solar spectrum as much as possible.
The blue light spectrum of ordinary LEDs is relatively high, lacking purple light, cyan light, short-wave green light and long-wave red light. At present, full-spectrum LEDs are realized by chip + phosphor. By adding purple light chip or adding blue peak and phosphor peak. Phosphors with wavelengths in the recessed region 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 quality of reproducing vivid red colors. Ra and R9 are both higher values, which are the performance of high-quality LEDs.
Compared with ordinary LEDs, full-spectrum LEDs have a more continuous spectrum and a wider color gamut; the color rendering index Ra is greatly improved, closer to 100; among them, the special color rendering index R9 can be as high as 90 or more.