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Old 05-06-2011, 08:05 PM   #1
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Lights

ok I know there's threads allover about lights, but I'm just getting more and more confused.

I bought a "daylight" fluorescent light bulb (6500K, 900 lumenes, 15w = 60w normal)..soooo, going by the watt per gallon rule (I know) it would take 8 of these to put my 125g at med light? Is that even close to being right? It seems kind of dim using just one on my 10g.
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Old 05-11-2011, 07:59 PM   #2
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What kind of bulb is it? Is it a compact florescent bulb, or a T8, or what?
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Old 05-11-2011, 08:20 PM   #3
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going off the fact that you said its a 60w equivalent, i'm guessing cfl? You really can't go off the wpg rule with any tank, especially bigger tanks. I don't even have 2wpg on my 125 and my glosso and hm are growing and carpeting quite well. This indicates it is on the higher side of the scale.
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Old 05-11-2011, 09:29 PM   #4
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yeah those are the spiral light bulbs, trying to figure out a good way to grow plants and keep it borderline co2 needy.. I need to just break down and buy a new ballast and get both my 96w pc going instead of just the one, and new bulbs.
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Old 05-11-2011, 09:33 PM   #5
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That would probably be your best bet. Cfl's aren't that great for bigger tanks IMO because of the reflectors ( or lack of)
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Old 05-11-2011, 09:45 PM   #6
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yeap, tweaking a hood setup for my 10 using 2 of them (spiral cfl) and I've gone and over did the light yet again (back to the green water) .. of course using the math above (I know, not a good idea) I only have 120watts of 6500K light on a 10g...meh, think I'll take one out and see if the water clears 9and stays that way) on the next water change day.

*side note I just noticed one of my grass shrimp has white/clear(ish) spots on it...any idea what this might be?
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Old 05-11-2011, 10:26 PM   #7
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the "equivalancy" rating of 60W does not apply... it counts as 30W.

I agree with rook, lighting a large tank with CFLs would not be an efficient way to go.
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