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Old 06-05-2003, 03:39 PM   #1
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watts per gallon

Refresh my memory, how many watts of light per gallon do you need just to get growth on LR. (no corals) Isn't it something like 2 or 3?
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Old 06-05-2003, 03:54 PM   #2
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I would say 5 to 7
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Old 06-05-2003, 04:18 PM   #3
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I've never heard it that high before
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Old 06-05-2003, 04:42 PM   #4
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I am only going experience and recent readings. The older books didn't mention much about this, but it takes a good amount of UV for coralline to grow amongst other photosynthetic algaes...I say that, because I had 160 watts on my 55 and that was not enough. I went to 384 and wow what a difference. Very noticeable. So, just from experience and recent publications, I say 5 to 7...and even 10 if feasable.
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Old 06-05-2003, 04:51 PM   #5
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Man, that is more than you need for shrooms isnt it?
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Old 06-05-2003, 05:00 PM   #6
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Well I'll never ever reach 10 & right now we don't even have the money to do more than 4-5. But on my last tank I was getting some decent growth with the 4-5.
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Old 06-05-2003, 05:02 PM   #7
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I think 3-4 is good enough, but hey. If you can do 4-5 do it
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Old 06-05-2003, 05:09 PM   #8
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If I were to go with a WPG, which I don't like, I'd say 3, but it really depends on the type of light.
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Old 06-05-2003, 05:16 PM   #9
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If the question is how much to keep live rock with out any corals then I would say it would be on the low end of the scale if there really even is a scale for it.

If your looking at softies and other such corals that are usually consitered lower light then it would be on the lower end of the scale. If your talking about looking at some of the hard stonie corals then it would be to the upper end of the range.

If yoru looking to go SPS and clams then shoot for something above the upper range.

One reason WPG is not the best factor is that only florecent lighting will cover the entire tank. If you have MH lighting and a tank that is longer than 2' then your not going to get the full wattage over the entire tank. For example if you have a 4' long tank and you put a MH bulb in the center you will have 1' on either end that is somewhat light with less light than the center 2' area.

WIth a watts per gal calculation if you have 1 175W MH bulb on a 55 gal tank that would equate to 3.18Watts per gal. But most of the light would be in the middle and very little would be on the ends. If you put 175W of florecent lighting on the tank the tank would be evenly light across the entire tank but the intensity at any one given spot would be lower than the center area of the tank that was light with 1 MH.

So to properly light a 55 with MH you would need two 175W bulbs to give even light plus you would probably go with some actinic lighting also. If you go with florecent lighting you would probably go with a couple VHO bulbs or a couple power compact bulbs.
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Old 06-05-2003, 09:58 PM   #10
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Quote:
Originally Posted by reefrunner69
If I were to go with a WPG, which I don't like, I'd say 3, but it really depends on the type of light.
Agreed.
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