[High-tech LED reporter / Yin Mingquan] "The LED lighting products of different manufacturers, even the LED lighting products of the same manufacturer, have large deviations in color temperature. It is difficult to control the color consistency when designing lighting effects. Zhao Ming, design director of Hong Kong Golden Eagle Design Co., Ltd., said that LED lighting products have become ordinary consumer goods, but LED is an emerging industry, and there is still a lack of corresponding standards. The problem of color temperature difference is more common.
The 3rd 3W LED ceiling lamp brand manufacturer data of the fourth round of CLEAR test project of Gaogong LED showed that there were 3 color temperature boxes on the outer packaging box, and 6 were marked as generalized (warm white/white). There are 14 color temperature parameter values, and the real standard rate is 60.9%. Among them, there are 4 enterprises with the difference between the measured value and the identification value exceeding +-250K, and 8 with the color temperature exceeding 6500K. 
When the color of the light emitted by the light source is the same as the color of the black body at a certain temperature, the temperature of the black body is called the color temperature of the light source. The industry also popularizes the light color of the day to change the reference value of the color temperature over time: 40 minutes after sunrise, the light color is yellower, the color temperature is about 3,000K; the midday sun is white, rising to 4,800-5,800K, cloudy noon It is about 6,500K; the light color is reddish before sunset, and the color temperature drops to about 2,200K.
In LED lighting applications, the consistency of color temperature is very important. Good color temperature consistency can render excellent lighting effects. Conversely, if the color temperature deviation is large, it is easy to appear in a variety of "mixed colors." "What we are most afraid of is the problem of individual lamps. If there is a problem to replace, it will be difficult to match the LED lights with the same color." A dealer in the Hongcheng Lianxin Market in Nanchang, Jiangxi Province said Now, the same batch of LED lights produced by the same company has inconsistent color temperature, not to mention different companies.
"From the perspective of packaging, the color temperature index is still normal within the range of plus or minus 250K, and it is difficult for the naked eye to distinguish it." The technical person in charge of a packaged company in Guangdong said.
In Zhao Ming's opinion, the average person in the 500K color temperature range cannot be distinguished, but the professional can still distinguish it.
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