The effect of LED lamps on the restoration of human skin color
LEDs produce white light at present. There are two commonly used methods: one is to use three colors of RGB LEDs, and to obtain white light of different color temperatures according to a certain ratio, which is called three-color white light; another method is on the blue LED die. Partially plated with yellow phosphor and encapsulated with resin. Once energized, the portion that is not coated with phosphor still emits blue light, and the portion coated with phosphor is excited by blue light and ultraviolet light to produce yellow light. The light of these two colors is The white light is mixed in the optical cavity, and the white light of different color temperatures can be obtained by adjusting the ratio of the phosphor, which is called dichromatic white light. 
Since the two-color white LED single-tube single-supply can generate the required white light, it is widely used in the field of illumination. The LED flat-panel soft light used in the TV news studio uses a two-color white LED as a light source. Figure 4 is a spectral energy distribution diagram of a two-color white light high color temperature LED light source provided by the manufacturer. Although the two peaks are still clearly visible from the figure, the connection is quite smooth and the lowest part of the joint is close to 80% of the energy value. Obviously, the color of the lamp is better.
With the rapid development of LED light source technology, the light efficiency of white light high power LED chip is generally about 100 lm/w, the light effect of the lamp depends on the variety of lamps, the astigmatism lamp is generally not more than 80 lm/w, and the color rendering index is nearly 85-90. . It also eliminates the color shift phenomenon of white LEDs, dimming without flicker, and the color tone of LEDs remains the same in the dimming range. Now, including the Oriental TV, many TV broadcast studios use high color temperature, high color rendering white LED lamps as a face light.
The author extracted the TV screens of several anchors in the TV broadcast room of Oriental TV, and used Colorshop to analyze the color. The analysis found that the red ratio in RGB is the highest, followed by green and blue. If the highest red is 100%, the green value is 75% to 80%, and the blue value is 60% to 65%. Let's look at the spectral energy distribution of the LED light source in Figure 4. The lower energy part is in the blue-green and yellow-green areas. The light of this part of the color has a relatively small effect on the skin color, so the skin color that is presented can still make people satisfaction.
Figure 4 Spectrum energy distribution of LED light source
In addition, since the illumination of the LED soft light has been greatly improved compared with the illumination of the conventional three-primary cold light, the picture effect has also been improved. The three-primary luminaires are only 2 m to 3 m away from the anchor, so be careful when pushing and pulling the lens, otherwise it is easy to “wearâ€. The LED luminaires can be 4 m to 5 m away from the anchor, and the panorama can be easily removed, as shown in Figure 5. Therefore, the host and the surrounding environment are “integrated†and echoed with other scenes, greatly enhancing the overall screen visual image. The TV screen is rich in layers and the characters are bright and shiny.
Figure 5 LED lamps use panoramic, close-up
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