When the color temperature is about 3000K, the light is yellowish. When the color temperature is about 5000K, the light is bluish. Different color temperatures have different lighting and visual effects. The picture shows how different colors correspond to different color temperatures.
Giving the eyes caused by different wavelengths of different color perception, from red, orange, yellow, green, blue, indigo (blue-violet), purple. Eye sensitivity varies with wavelength and strong change. For example, under good lighting conditions, the eye sensitivity to light of wavelength 550nm (yellow) is 20 times as red or blue. This is why most of the car’s fog lights and street lights use a yellow important reason. Color temperature is a standard of the color’s temperature, not measure the brightness of the lamp. Halogen 2300K color temperature can be made to 7000K; HID lamp color temperature from 4200K to over 8000K; the higher the color temperature of light, its fog and rain penetration worse (not light). The following is a different color temperature performance:
3000K yellow light, strong penetrating power.
4200K white with yellow, the original car xenon lamp.
5000K white light, the highest temperature gauge.
6000K light all white, with blue.
6500K in the sun during the day.
7000-8000K white with blue.
More than 8000K blu-ray, penetration is poor. – See more at: http://www.upshinelightingusa.com/led-light-color-temperature-and-brightness.html#sthash.huvTgUxt.dpuf