There are two ways to obtain white light mainstream. One RGB three primary colors are mixed to obtain white light, and the other is to generate white light by exciting a special phosphor coating by blue light emitted by a blue LED. The three primary colors of white light are not elaborated for a moment. For the simple technology of blue LED to excite phosphor to generate white light, the blue chip will convert the blue-emitting phosphor coating with wavelength of 450-455 nm into visible spectrum, but with the thickness of the coating. Increasingly, the resulting visible spectrum will gradually turn to yellow light, which is manifested as a color shift at wide angles. This problem basically exists for all white LEDs, and the amount of color drift depends on the LED phosphor quality and coating design. 
The light from the LEDs seems to be in one direction, but in fact the color has a lot of quality problems at wide angles. Here is a simple way to test the light quality of white LEDs. Take a piece of white paper on top of the LED bead to see if there is any yellowing on the wide angle edges.
Secondary optics
Secondary optical design, especially the lens scheme, is prone to color separation when doing special light patterns and small angles. The design principle of the secondary optical lens is as follows. It is based on the primary optics of the LED to deepen the design and design the light emitted by the LED to a suitable position. However, if the LED lamp bead is not a lamp with a good package. The original light emitted has a significant color deviation, so the problem is amplified in the secondary optics, resulting in more serious color drift. Is there a way to solve the original sin problem of correcting this LED?
The answer is yes, some special surface treatment techniques can be done on the secondary optics to reduce the color separation of the LED spectral distribution. There are a variety of surface mixing techniques, from the simplest matte surface to the race surface, to the complex surface treatment of the blending process, such as the RZ blending surface of Finnish LEDIL Optics.
Compared to the uncontrolled frosted surface technology of the optical path, this RZ color mixing surface treatment technology maximizes uniformity, controllable light path and high efficiency. What is the principle? Please see the illustration below:
This kind of special light mixing technology is difficult to design and grasp the surface texture. It is necessary to reprocess the original light of the LED after the TRI optical design, close to the quality problem of the original LED light, and to ensure two major points. First, the optical application angle designed by the original TRI cannot be changed. Second, it is necessary to ensure high optical efficiency. At present, the efficiency of the light mixing effect is guaranteed to be no more than 70%. This new patented hybrid technology works with an optical device with an efficiency of up to 90%.
After talking about the principles and features, what is the application direction of this mixed-light surface treatment technology? This problem is better. If there is no technology that actually uses value in this society, it is a waste of development resources. The main directions of use are probably several.
1, RGBW and other color LEDs can be freely combined with light distribution, no need to worry about different color light layered color separation, free to control the color ratio; can do stage lighting, architectural lighting, mood lighting, intelligent lighting .
2, medium power LED: medium power chip has a high cost performance compared to high power chips, the future market will continue to expand, but the original light quality of medium power LED will be relatively poor, the design and application of secondary optics in this case The requirements are even higher, and this surface mixing technology will play a big role.
3. For COB : At present, there are many kinds of COB chips on the market, and there are many different kinds of COB chips. Even the secondary optical solutions for COB provided by the first-line world brands may have the following types of spots. The left side is very beautiful and the right side is obvious. Color separation. If you use a COB chip that is not so good, this phenomenon will be more serious. For this kind of chip that has insufficient, you can also use this surface mixing technology to do secondary processing, correct the light, and obtain good effect lighting. effect.
In summary, the light quality of LEDs is very important. Lights are not lit up, but light is used. Do a good job of lighting, do professional lighting, use good light!
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