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Originally Posted by fortheloveofcrabs
Higher K, more watts. Simple. I have a 16 gal nano with a 175 watt 20k and it looks great, and growth is good (1 polyp candy has grown to 19 polyps in 8 months, 1 polyp torch to 4 polyp in 6 weeks). I am upgrading a 400 watt 20k so I can keep SPS corals (I say Josh's cat's paw and fell in love!) But that's my 2 cents... 20k all the way!
-Pauli
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The temperature rating of a bulb has no correlation to wattage. A bulb consuming 175 watts will remain the same regardless of the bulb's kelvin rating.
Personally, I find 20k kelvin bulbs are decent looking on well stocked tanks. If you're running a 'bare bone' tank with not much live rock and corals, then you'll get nothing but glowing blue sand. It is really preference. Take up some of the member's offers and go take a look. It's the only real reference you'll be able to get.