Lighting color is measured in degrees Kelvin. Running through the spectrum, the higher the Kelvin temperature, the closer to pure white light The light on bright sunny day with blue sky measures 5,600° Kelvin. A very bright day with a cloud-covered sky weighs in at 6,000° Kelvin. An incandescent (regular) bulb gives off light at approximately 3,200° Kelvin. This is quite yellow, as evidenced by photographs taken by lamp-light. But our eyes are used to the color and in most circumstances it looks normal if not pleasing. By contract, most fluorescent lighting is a color called “cool white” used because it is the cheapest color to produce. Cool-white is 4,600° Kelvin and definitely green. Any photo taken under cool-whites looks green to the viewer. A color-corrected fluorescent and LEDs used in our mirrors usually run between 5,000° and 5,400° Kelvin, and approximates blue-sky daylight. The closer to daylight color the more expensive the bulb.
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