lighting for a 220 g - The Planted Tank Forum
 
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post #1 of 6 (permalink) Old 02-04-2008, 03:01 PM Thread Starter
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lighting for a 220 g

I have a tank of 220g with 4 neons (T12) of 40W each, I don't think my lighting is high enough for my plants,

how many watts should I use for that size of tank??
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post #2 of 6 (permalink) Old 02-04-2008, 05:09 PM
 
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Id agree with you...

I try to make sure I have atleast 1.5 watts per gallon for low/medium light planted tanks and 2 - 2.5 watts per gallong for medium/hugh light planted tanks.

Youll probabably grow some good algae though....

I had 98 Watts on a 100G tank and struggled to get my plants going. Seemed the algae outcompeted them at every turn. When I bumped it up to 172 (4x39w T5, 2x 8W T%) things picked up almost immediately.

I would have used more, but its a corner tank so its a pain to fit lighting to it.

That being said, how much light you want depends on a few things. How deep is your tank? 220G is alot of water, and depth has a huge impact on how much light reaches the plants.

What are the dimensions of your tank?

other things I would watch are the colour spectrum of the tubes you are using and what the light needs of your plants are.

theres some pretty good posts on here that i dig up form time to time.

Marc
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post #3 of 6 (permalink) Old 02-04-2008, 06:27 PM Thread Starter
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dimensions

my tank is 72'' long and 24 inches deep
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post #4 of 6 (permalink) Old 02-04-2008, 07:02 PM
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I think Cjunky meant how high is your tank? Most 220s are 72 long x 24 wide x 30 or 31 high. I try to avoid the term "deep" in relation to tank dimensions because some people use it as a reference to height (top to bottom) and some to width (front to back).

Most people with tanks that size go for metal halides. Three 150 Watt MHs would be good, or 3 x 250 if you really want it to blaze like the sun.

As for non-halide alternatives, there aren't a lot of good choices. You could use two T-5 fixtures, each 36" long and containing 6 lamps. You could use 4 x 96 Watt power compacts. You could use 3-4 VHO flourescents. But if it were me, I'd use the 150 W metal halides.
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post #5 of 6 (permalink) Old 02-04-2008, 10:51 PM
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My light hood for my 180 (72 x 24 x 24) holds 6 - 6' VHO bulbs, but I only run 4 of the bulbs.
Steve
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post #6 of 6 (permalink) Old 02-06-2008, 12:01 AM
 
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canoe2can: exactly.

The thing about metal halides is you have to watch put for a couple of things.

They can be a little on the "blue" side.
They get real hot
Their dispersal is only as good as the reflector backing them up. - Thats true for all lights but its more of an issue with halides.

I would suggest getting a combination of halides and T5 tubes. Maybe something like a 6 foot over-tank or hanging pendant with either 2 or three 150w halides and either 2 or 4 T5 tubes.

That would give you plenty of light and be one complete unit, hopefully with fans too.

theres quite a few that meet that spec on the market.

I would suggest against 250 watt halides becuase youre likely to cook your tank unless you hang it high. At the very least you would be overheating in the summer.

To be honest a pendant with 2 x 150w halide and 2 x 54 watt T5 would be plenty. giving you just shy of 2 watts per gallon.

im sure eveyone else will have their opinion too

Marc
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