Switching out lights: From T5HO to NO t8/t12 - The Planted Tank Forum
 
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post #1 of 5 (permalink) Old 07-26-2011, 05:30 PM Thread Starter
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Switching out lights: From T5HO to NO t8/t12

I have been running my 7 foot 210 gallon tank with only 2 out of 4 rows of T5HO lights pointing into the tank, the rest have been pointing up into the roof to provide ambient light. There are 2 four ft fixtures and 2 3 foot fixtures accounting for 372 watts of light total, only half of it pointing into the tank.

I am looking at getting 4 3ft NO fixtures (t8/t12) and replacing my existing setup with these, running half the bulbs 6500 sun and the other half plant gro. I am growing ferns and crypts and swords and anacharis well with my current rig with little algea. Would this new system provide me the light I need without going overboard?


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post #2 of 5 (permalink) Old 07-26-2011, 05:56 PM
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When you say 4 fixtures... do you mean with single or double bulbs. I think 4 double bulb fixtures would keep you ok. I don't think single bulbs would be enough. Don't take my word on it though. Perhaps someone else can chime in. But looking at the lighting chart in the lighting section (here), would lead me to believe so. You do have a pretty deep tank, correct? 28 inches?

Lighting Chart that member Hoppy put together.

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post #3 of 5 (permalink) Old 07-26-2011, 07:56 PM Thread Starter
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Sorry my bad, Yes you are correct in that they are double bulb fixtures. My tank is 24 inches deep with apx 3 inches of sand and the lights about 8 inches off the water. My current setup rates as low according to the chart and I am very happy with it, so 4 bulbs of T8 would probably work well. My most succesful plant tank ever was a 55 with a 2 bulb shoplight running t8's


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post #4 of 5 (permalink) Old 07-26-2011, 08:54 PM
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Quote:
Originally Posted by BonesCJ View Post
My most succesful plant tank ever was a 55 with a 2 bulb shoplight running t8's
Which, according to Hoppy's chart, can't even provide minimum amount for low light....

Altho I have the same experience; two bulb shoplights provides very good lowlight on top of standard 55 and 75 gallon tanks for a non-CO2 environment. 55 and 75 gallon are, what, 20-22 inches? So I'm guessing when you go from two HO bulbs 8 inches over the tank to two NO bulbs you'll drop the lights to the top of the tank and all will be well. Correct?

In defense of Hoppy's effort, I think his numbers are for a T8 striplight fixture without any real reflector at all, not even the usual white painted metal reflector that part of a standard shoplight.

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post #5 of 5 (permalink) Old 07-26-2011, 09:01 PM Thread Starter
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Very possible about the reflectors, and the inside of my canopy is painted all white so that helps too.


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