Interpretation of LED light color knowledge

The standard chromatic observer is actually the response function of the human eye to the spectrum. The whole color can be simulated as the integral process of the spectral energy distribution in the response function. For those who do not study the color principle, we don't need to go deeper, we only need to know the standard chromaticity. Observer, he is not an individual, he is right.

Remember that at 555nm, the closer the spectral distribution is to 555, the higher the luminous flux will be.

In fact, the color is very simple. If you figure out the horseshoe figure, you will understand everything.

1. The outermost layer of the trajectory is the spectral trajectory. The color of each point has a corresponding monochromatic spectrum, and the bottom line is called the purple line. There is no spectrum corresponding to it, and two colors are needed.

2. x, y coordinates. The physical meaning of x, y is actually the proportion of red and green in a certain color. For example, the coordinates of white energy are (0.333, 0.333), meaning that red accounts for 33%, green accounts for 33%, and the remaining blue accounts for 33%. %

3. After waiting for the white point to draw a straight line, the two points mixed with the spectral trajectory can be mixed with white. The most direct example is blue and yellow mixed into white. Everyone looks at the picture, is it like this? child?

4. A black track in the middle is the black body track, and the color temperature points are above this track.

The color temperature that has been said in the industry is actually the relevant color temperature. If the color temperature is the only color point, the color temperature is the same as the two colors, but if the color temperature is the same, there will be a difference. For this reason, to color-code the packaged products, the concept of color tolerance SDCM should be set.

1. When the color temperature of the light source to be tested is greater than 5000K, the standard illuminant D is selected as the reference standard, and when the color temperature is less than 5000K, the black body radiation is selected as the reference standard.

2. When selecting the reference standard color temperature, the light source to be tested should have the same or similar coordinates as the reference illuminant, and the chromaticity difference is less than 5.4X10-3.

Most people will say how close they are to the color development ability when introducing the color rendering index. In fact, the color rendering index is the result of reference to the standard illuminant. The calculation process is as above, which is the average of multiple color patches. value.

Since the radiated power of the chip will be different, the combined flux of the emitted light and the energy of the yellow-yellow light of the phosphor will appear in a " tug-of-war state": the blue light is strong, the color coordinates are biased toward blue light: the blue light is weak, and the color coordinates are biased toward yellow light.

The second difference is the difference in coordinates caused by different excitation wavelengths. Remember the line drawn earlier? For example, there are 455, 458, 461, 463 blue light, the excitation wavelength of the phosphor is 550, and there are 4 points in the connection.