05-02-2009, 06:35 PM
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Originally Posted by Kellsindell
10,000K(Kelvin) or 10K , is pure white while 20,000K, or 20K, is very blue and i used as a actinic suplimentation bulb. It's a way to measure the wavelength of the bulbs, but it also tells you the intensity of the light. Contrary to popular belief, the 10K will put out more PAR (Photosynthetically Active Radiation) then the blue bulbs do. There's quite a differance between a bulb that is 10,000K to a bulb that is 12,000 or 14,000K, the PAR is going to be lower for these. PAR is important because it's the ready energy the corals need to consume and grow. I personally use 14,000K bulbs and enjoy the blue that I'm getting out of my bulbs. It's not as intense as the 20K, but it's not as white as the 10K.
I hope that helps. I'm doing PAR measurements myself and hope to be posting some #'s here in a few days.
agree with ya here Kellsindell. I personally use 12,000K or 14,000K, with atenics of course, but over all this was a pretty good explanation. Good thread