Principle and function of color temperature of tungsten filament bulb

Tungsten filament bulbs must be familiar to everyone. Although it has been replaced by many lighting fixtures and gradually faded out of our lives, the convenience it once brought us is irreplaceable. Do you know the concept of color temperature of tungsten filament bulbs? The so-called color temperature is simply a measure used to express the light color of light sources (such as tungsten light bulbs, film and television lens shooting, flashlights, TV screens, etc.). Then, I'll tell you about its principle and function.

Principle:

Kelvin believes that if a pure black object can absorb all the heat falling on it without loss, and at the same time release all the energy generated by heat in the form of "light", then the wavelength of its maximum radiation intensity will change with the change of temperature. For example, when the thermal power of the blackbody is equivalent to 500-550℃, it will turn dark red (the radiation intensity of a certain red wavelength is the largest), and it will turn yellow when it reaches1050-150℃ ... Therefore, the color composition of the light source corresponds to the temperature of the blackbody. Color temperature is usually expressed in kelvin temperature (k), not in degrees-days. 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 calculation method of color temperature 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.

According to this principle, the color temperature of any light is equivalent to the "temperature" when the black body emits the same color. Color is actually a psychological and physiological function. All color impressions are caused by intermittent spectral reactions on the eyes, so color temperature is only used to express the visual impression of color.

Function:

The preference for color temperature varies from person to person, which is related to the scenery we see every day. For example, people near the equator see an average color temperature of 1 1000K(8000K (dusk) ~ 17000 K (noon)), so they prefer a high color temperature (it looks more realistic), and vice versa. On the contrary, if you watch subtropical customs on TV with low color temperature, you will feel a little red. )

The above statement is a common misunderstanding. Normal people of different races and races on the earth feel the same about color. Don't think that regions or iris colors are different. The color you see will be different. Imagine that the United States has different races from all over the world. If people have different perceptions of the same color, why have they never heard of movies, TV programs and magazines and received complaints from different races about different color casts? This in turn proves that all people should see the same color (except color blindness).

According to the change of temperature, the color of the light source will change slightly. In fact, there is still a lot of knowledge about color temperature, but with my knowledge and experience, I can only introduce you so much here. The above are some basic information about the color temperature of tungsten filament bulbs. If you are interested in this knowledge, you can go to the library to consult relevant materials and books yourself. But anyway, I hope the information provided above can help everyone.

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