What color light is 4k?

1. The color temperature of LED lamp is warm white at 4K.

2. according to China's "national standard for lighting lamps", 4-57k is warm white. The color temperature of the lights in big shopping malls and hotels is basically about 4K K. 4 is officially called cold white, and 4-5 (neutral white) is good for home use.

3. Color temperature is a unit of measurement that represents the color components contained in light. Theoretically speaking, color temperature refers to the color of an absolute blackbody after it is heated from absolute zero (273℃). After being heated, the black body gradually turns from black to red, yellow and white, and finally emits blue light. When heated to a certain temperature, the spectral components of the light emitted by a black body are called the color temperature at this temperature.

Extended information:

Principle

1. Kelvin believes that if a pure black object can absorb all the heat falling on it without loss, and at the same time can release all the energy generated by heat in the form of "light", the wavelength of its maximum radiation intensity will change with the change of temperature.

2. For example, when the thermal power of a blackbody is equivalent to 5-55℃, it will turn dark red (the radiation intensity of a certain red wavelength is the maximum), and when it reaches 15-115℃, it will turn yellow ... Therefore, the color composition of the light source is corresponding to the temperature of the blackbody.

3. Color temperature is usually expressed in Kelvin temperature (k), not in degree-day. In the process of striking iron, black iron gradually turns red in the furnace temperature, which is the best example of blackbody theory. Usually, the tungsten wire in the bulb we use is equivalent to this black body. The color temperature calculation method is based on the above principle, and K is used to correspond to the color representing the maximum wavelength of an object when it radiates at a specific temperature.

4. According to this principle, the color temperature of any light is equivalent to the "temperature" of the black body emitting the same color. Color is actually a kind of psychological and physical function, and all color impressions are produced because of the intermittent spectrum reaction on the eyes, so the color temperature is only used to express the visual impression of color.

Reference: Chinese government website-Energy Conservation Law of the People's Republic of China.