The color temperature of light refers to the temperature to which one would have to heat a "black body" source to produce light of similar spectral characteristics. Low color temperature implies warmer (more yellow/red) light while high color temperature implies a colder (more blue) light.
Daylight has a rather low color temperature near dawn, and a higher one during the day. Therefore it can be useful to install an electrical lighting system that can supply cooler light to supplement daylight when needed, and fill in with warmer light at night. This also correlates with human feelings towards the warm colors of light coming from candles or an open fireplace at night.
Standard unit for color temperature is Kelvin (k).
(In fact, the kelvin unit is the basis of all temperature measurement, starting with 0 k at the absolute zero temperature. The "size" of one kelvin is defined as the fraction 1/273.16 of the thermodynamic temperature of the triple point of water, which positions 0° Celsius at 273.16 k.)
Some typical color temperatures are:
1500 k Candlelight
2680 k 40 W incandescent lamp
3000 k 200 W incandescent lamp
3200 k Sunrise/sunset
3400 k Tungsten lamp
3400 k 1 hour from dusk/dawn
5000-4500 k Xenon lamp/light arc
5500 k Sunny daylight around noon
5500-5600 k Electronic photo flash
6500-7500 k Overcast sky
9000-12000 k Blue sky
At this place it shouldn't be forgotten that a color temperature value, though expressed as a single number, doesn't describe a simple property. In reality, it only summarises the spectral properties of a light source. Two light sources with the same light color can differ widely in quality, eg. when one of them has a continuous spectrum, while the other just emits light in a few narrow bands of the spectrum.
I'm not sure if your argument is for the lights. If you are, you are somewhat correct with the color temp has nothing to do with the brightness....but guess what. Purple color, compared to a white color. Which one will contrast with the color of the road the best to light it up? Purple? I bet not. Why is it, that yellowish lights are used for foul conditions; maybe thats not a good argument, but honestly,,,,,purple light on a dark paved road isnt going to light up shit!!!!Mojo-Jojo said:Unfortunately, color temperature has nothing to do with brightness, just the warmth/coolness of the light.