can you have to much light - The Planted Tank Forum
 
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post #1 of 11 (permalink) Old 02-06-2004, 05:39 PM Thread Starter
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ive been round the local lfs shops in my area and one of them is selling a twin 250 watt metal halide light .would this be over the top for my 4x2x18 aquarium as its 500 watt output, he only wants 200 for it


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post #2 of 11 (permalink) Old 02-06-2004, 06:17 PM
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If you want to grow a tank of algae, thats the lighting I would use. Thats about 5.6 WPG in MH! Assumning your tank is ~ 90 gallons. You will mostly be battling algae and nutrient problems all the time with that amount.

For larger tanks, about ~2.5 wpg is a nice and balance amount of light.
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post #3 of 11 (permalink) Old 02-06-2004, 09:08 PM Thread Starter
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thanks alot mate,another quick maybe silly question is 70 of mh light the same as 70 watt of floresence


thanks

hixy
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post #4 of 11 (permalink) Old 02-06-2004, 10:03 PM
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Fluorescent and MH light have a similar efficiency, so the watt output is comparable. 500 Watts is a lot of light and a lot of heat.

Remembering all the algae stories of MH owners, I wouldn't...
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post #5 of 11 (permalink) Old 02-06-2004, 10:44 PM
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Actually... from personal experience.. thats not too bad.

If you raise the fixture away from the top of the tank by say.. 8-12" you will have fantastic lighting for a planted tank.
There is absolutely no reason why you cant use MH lighting over a planted tank, you just have to be aware of a few things like Heat, intensity etc.. some plants may react a bit to the intense non-diffused light but they will adapt.
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post #6 of 11 (permalink) Old 02-06-2004, 11:45 PM
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Well yeah, if you raise the height of the lighting then it will be less a problem. I think that would be nescessary for HM becuase of the heat. So in fact it could work, but trial and error will need to find the proper height; and 500W is still alot.
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post #7 of 11 (permalink) Old 02-06-2004, 11:56 PM
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If you have two hundred pounds to spare, go for it. Supend them well over your tank and create one of those beautiful open-topped planted tanks.
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post #8 of 11 (permalink) Old 02-06-2004, 11:58 PM
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Mario's got the idea ;-) I've been thinking I might just do this for my 135 Gallon :-) Set up 2-3 250 watt pendants over it... hmmm...
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post #9 of 11 (permalink) Old 02-07-2004, 12:10 AM
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Open top tanks are beautiful, with plants growng out of them etc. I love watching fish from above the surface of the water. When I redo my tanks I am making them both open top.

got CO2?
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post #10 of 11 (permalink) Old 02-07-2004, 12:31 AM
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Beautiful, yes. But evaporation, and condensation on the cold walls of your sweet home need to be considered...
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post #11 of 11 (permalink) Old 02-08-2004, 04:47 AM
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wasserpest.... none of my tanks have lids exactly.. I have 3 windows open at all time. I dont need to heat my place either because I have enough lights and computer equipment running it keeps everything toasty.. lol
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