08-27-2012, 05:32 PM
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Originally Posted by aklick
out of curiosity what is the difference between full spectrum and cool white?
Full spectrum technically means the full light spectrum of colour wavelengths from infrared to ultraviolet. In practice, tubes can vary a lot while still being termed full spectrum, and one has to examine the spectral graph of each tube.
Cool white has a higher level of blue light (and less red) so it moves to the "cool" side. Warm white is the opposite, more red and less blue.
Kelvin is often used in this, although technically it has no direct relation to spectrum. But for our purposes, it can serve as a guide. Aquarium plants in controlled studies grew better when placed under light having a K between 6000K and 7000K, which is why most of us recommend this range. "Daylight" or "cool white" is used in connection with these.