PFO 250 Watt Metal Halide Retrofit for a 120? - The Planted Tank Forum
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post #1 of 3 (permalink) Old 09-10-2005, 07:59 PM Thread Starter
Algae Grower
Join Date: Apr 2005
Location: Huntington Beach, CA
Posts: 19
PFO 250 Watt Metal Halide Retrofit for a 120?

I have a 120g (4'x2'x2'), and was trying to figure out lighting.

I was thinking either a single PFO 250 Watt Metal Halide Retrofit, or 48" 4x65watt compact retrofit.

What do you think is the better choice?
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post #2 of 3 (permalink) Old 09-10-2005, 08:51 PM
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Join Date: Jan 2003
Location: San Jose, CA
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If you go with metal halide, you should use 2x150W, or 2x175w. A single bulb will have terrible coverage over 4ft. The rule of thumb for metal halide is one per 2 feet.

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post #3 of 3 (permalink) Old 09-11-2005, 07:39 PM
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Location: Piedmont - NC
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Agreed, 2 MH bulbs would be needed for that tank. I have 2x175MH on my 110x and it covers it well. 1 bulb wouldn't come close to doing the job. I would look more at 150W since bulbs seem easier to come by in different color temp, but you can find bulbs 6500K-10,000K in the 175w with a little searching. In a 2ft tank MH will give you deeper light peniration then the PC (I run both 2x96W PC and the 2X175W HM), 110x is 30in deep.
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