How to test the color temperature of LED?

The detection of led color temperature can only be measured by special instruments. If you look with your eyes, you can only see roughly. Color temperature below 5000K is yellow, 5000-7500K is white, and above 7500K is blue.

Under normal circumstances, from noon 10 to 2 pm, when there is no cloud and direct sunlight in clear Wan Li, the standard sunlight is about 5200 ~ 5500 K, and the color temperature of news photography lamp is 3200 K; ; Generally, the color temperature of tungsten lamp and ordinary bulb lamps used in tungsten lamp and photo studios to take black and white photos is around 2800 K; ;

Because of the low color temperature, the photos taken in this case will feel yellow after printing. The color temperature of ordinary fluorescent lamps is about 7200~8500 K, so the photos taken under fluorescent lamps will be cyan.

The color temperature of LED bulbs is generally divided into warm white (about 2200 K-3500 K), normal white (about 4000 K-6000 K) and cold white (above 6500K). Different color temperatures of light sources lead to different light colors.

The color temperature is below 3300K, and red gives people a warm feeling; There is a stable atmosphere and a warm feeling. Commonly known as warm color temperature. The color temperature is between 3000-6000 K, and people have no obvious visual and psychological effect in this color, but have a refreshing feeling; So it is called "neutral" color temperature. The color temperature exceeds 6000K, and the light color is blue, giving people a cold feeling, which is generally called cold color temperature.

The color temperature exceeds 6000K, and the light color is blue, giving people a cold feeling, which is generally called cold color temperature. The color temperature of the LED lamp refers to the color when the LED lamp emits light, which is generally divided into three types: warm white (2700K-4500K), normal white (4500 K-6500K) and cold white (above 6500 K).

Extended data:

The concept of color temperature is based on a fictional black object, which emits different colors when heated to different temperatures, and its objects appear in different colors. Just like you heat an iron block, the iron block turns red first, then yellow, and finally white.

The color temperature calibrated by this method is just the opposite of what the general public thinks is "warm" and "cold". For example, people usually think that red, orange and yellow are warmer, while white and blue are colder. In fact, the color temperature of red is the lowest, and then gradually increases to orange, yellow, white and blue, and blue is the highest color temperature.

When shooting in natural light, because the color temperature of light is different in different time periods, the color of the photos taken is also different. For example, when shooting under a clear blue sky, the color temperature of the light is high, and the photo is cold; But if you shoot at dusk, the color temperature of the light is low, so the photo is warmer.

References:

Baidu encyclopedia-color temperature