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Old 08-12-2003, 07:15 PM   #1 (permalink)
 
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I have been looking at 2 x 150w metal halide fittings for my 4x2x2 tank. Can someone tell me how high they should be above the water surface? Will this be too high a wattage for this tank?

Dave.
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Old 08-12-2003, 07:15 PM   #2 (permalink)
 
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I have been looking at 2 x 150w metal halide fittings for my 4x2x2 tank. Can someone tell me how high they should be above the water surface? Will this be too high a wattage for this tank?

Dave.
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Old 08-12-2003, 07:27 PM   #3 (permalink)
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(48x24x24)/261 = 105 gallon

150x2 = 300 watt. approx 3 wpg. It is perfect for growing plants especially when MH can penetrate the water quite well. I had mine hanging above the glass lid 5-6 inch high. it is a good way to reduce the chance of raising water temp. However, a lot of light is lost to the room on the way down. I am sure you can keep it as close as 2 inch from the glasslid. it will still give it enough room for ventilation. You will notice the water heating up a little though.


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Old 08-13-2003, 04:06 AM   #4 (permalink)
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i have hanging MH pendants which are about 10" off the middle brace. I built a canopy supported by teh wall in order for the light not to be lost to the room. 2 out of 3 of my 120s have either 425W or 500W, and I'm looking for another 175W pendant to get the 3 tank up to par.

My aquariums are open top. I do not use the glass lids since it seemed to just reflect the light and generate more heat within the tank.

120 Oceanic: S. American Creek/425W-MHs/2228+2026 Eheims/Dupla Reactor 400
120 Oceanic: algae and java fern
120 Oceanic: SE Asian ditch/500 W-MHs/2028+2226 Eheims/Dupla Reactor 400
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Old 08-14-2003, 01:22 PM   #5 (permalink)
 
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6-10" is best. They will penetrate 24" just fine at this height. Biggest question is glass tops/glass lenses on the lights to protect from splashes. Any splash against the bulb will make it explode like a cheap firecracker.

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