09-22-2012, 04:48 PM
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Originally Posted by Byron
I was going to initially suggest CFL daylight bulbs too, but consider that long-term these will take more energy. Over a 50g tank you would need 4 CFLs and even with 13w [which is too little, more below] this means 54w of power being used, compared to the dual T8 fluorescents which would likely be 25w with 50w max. But the 13w CFL willnot be sufficient, another member had this and it wasn't enough. But if that doesn't matter, fine.
I agree about the wattage and efficiency issues, although it's a moot point now for this installation. The figures are actually worse than that. A 48" 55g tank would require a higher wattage bulb to illuminate the 21" height properly. I just don't have enough information about CFLs to make any kinds of calculations about them, even the illumination radius at 21". I'm going to look around and see if I can get some more information than what is on the box.