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About UV LED sterilization: How many people make low-level mistakes?
- Aug 27, 2018 -

In the LED packaging industry, the most problematic problem for engineers is the technical problem of the color temperature of white light. Why is this so? This has to start from the source of white light color temperature.


1. First, the production of white light.


As long as it is done in LED packaging, it should be known that white light is white light on the basis of the blue chip (for why the blue chip is used for powder, you can go to the relevant LED technology website for reference). This is in terms of a single chip. Developed to the current multi-chip integrated LED, and to do white LED, there is another way, is to mix light. The problem of light mixing technology is also a problem that many LED packaging manufacturers are actively paying attention to.


2. The wavelength and color temperature of white light.


In more cases, we will not speak the wavelength of white light. Because, white light, in the principle of illumination is a mixed color of colorful light. Therefore, we generally pay more attention to the color temperature of white light.


The color temperature (colo(u)r temperature) is a measure of the color of the light source in K (Kelvin). Color temperature is an important application in the fields of photography, video, and publishing. The color temperature of the source is determined by comparing its color to the theoretical thermal blackbody radiator. The Kelvin temperature of a hot black body radiator matching the color of the light source is the color temperature of that source, which is directly related to the Planck blackbody radiation law.


In terms of LED packaging technology, the color temperature of the normal market is two ranges: 6000-7000K (white) and 2000-3000K (warm white). Beyond this range will make the light blue, the higher the color temperature will be blue, and the colder it will be; the lower the temperature, the warmer it will be. Knowing this range, just explain the following question: If, I only need to do 3500K white light lED lamp beads? So, can you control the range of 50K when it is packaged?


Why should we control this range? This is for a reason. Generally speaking, if the color temperature difference is too large, then the effect of the light source that is illuminated after lighting is also different. In general, as long as the difference is 200K, it will be obvious.


Test method: Take a piece of white paper and put it in front of the light source. (If your product is RGBW four-in-one-and-eight-foot LED lamp bead) you will find out - if there is obvious light and dark change, then prove this color temperature The difference is at least 200K.

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Different LED finished lamps, different lighting fields have different requirements for this color temperature. The requirements for LED stage lighting are not obvious, because the main requirement is color, not color temperature; however, if it is an aquarium light, it will not work. Although aquarium lamps are also in demand for color, in contrast, when enjoying the lighting effects of aquarium lights, we are generally in a relatively quiet environment. At this time, our observation will be easier. Capture the difference between light and dark.


3. The future of white light, the breakthrough of technology is the key.


Now, everyone should be able to know that color temperature control is a very difficult problem. For this color temperature problem, a better solution requires more technical support in addition to the engineer's intention to carefully control (with powder). An important source is the chip! When one day, the chip itself can reduce the demand for phosphors, then this technology, this color temperature control will be easier.