Smart lights RGB, RGBW, RGBCW, refer to the following, respectively
RGB refers to the three colors of red, green, and blue light, which can mix various colors of light.
RGBW: refers to warm white light in addition to the red, green, and blue three-color light.
RGBCW: refers to warm white light + cold white light in addition to the red, green, and blue three-color light.
Everyone knows about the red, green, and blue three-color light here, so I won’t explain it. Then, regarding warm white light and cold white light, I have to mention another knowledge point here, which is called the color temperature value.
What is the color temperature value?
In the lighting industry, the color temperature of light refers to the black body radiation. With different temperatures, the color of light is not the same. The black body presents a gradual process from red-orange-red-yellow-yellow-white-white-blue-white. When the color of light emitted by a certain light source looks the same as the color of light emitted by a black body at a certain temperature, the temperature of the black body is called the color temperature of the light source (the absolute temperature of a full radiator with the same chromaticity as the measured radiation).
According to the absolute temperature property of the color temperature of light, the color temperature identification unit of light is also the unit of the absolute temperature scale (Kelvin scale): K (Kelvin), and the color temperature is usually expressed as Tc.
When the temperature of the "black body" is higher, the more blue components in the spectrum, and the less red components, for example: the light color of incandescent lamps is warm white, and its color temperature is marked as 2700K, which is generally called "warm light"; while the color temperature of daylight fluorescent lamps is marked as 6000K, because after the color temperature is increased, the proportion of blue radiation in the energy distribution increases, so it is generally called "cold light".The color temperatures of some common light sources are: standard candlelight is 1930K; tungsten lamp is 2760-2900K; fluorescent lamp is 3000K; flash is 3800K; midday sunlight is 5600K; electronic flash is 6000K; blue sky is 12000K to 18000K.
Different light source color temperatures, light colors are also different, and the feelings they bring are also different.
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Color temperature and brightness: under the irradiation of a high color temperature light source, if the brightness is not too high, it will give people a cold atmosphere; under the irradiation of a low color temperature light source, too high brightness will give people a stuffy feeling.
