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#3
08-30-2010, 01:19 AM
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I would say 6 is the way to go, because if you find it is to much light and get the right fixture with individual switch you can always turn 1 set off. Can't turn and extra set with a 4 bulb if it's not there.
 But who am I to say what is right or wrong, I have 8 bulbs per 4' of tank that is 18" deep.
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Feed the bear goodies, make a new friend, don't feed the bear............... 8' - 165gal Reef DIY LED's Build 2012 Nano Contest Winner Febuary 2013 POTM Winner 300 gal + 60 gal Complete DIY Build 
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#4
08-30-2010, 03:46 AM
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There are huge differences in performance of T5 fixtures. Even more important than the number of bulbs is active cooling, reflectors, and ballasts. I echo carnut and highly recommend ATI T5 fixtures.
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   www.BlueWorldAquariums.com Portfolio builds: XBOX 360 Pico Reef | Don's 185 Deep Reef | Microsoft Game Studios Victoria's 225G Reef | Belmiro's Restaurant 125g Reef -Spencer Last edited by Blue World Aquariums; 08-12-2011 at 07:34 AM.
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#5
08-30-2010, 04:17 AM
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As previously mentioned, the width of your t5 fixture depends on the front to back depth of your tank
+1 on a good 4 bulb being WAY better than a cheap 6 bulb!
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