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Old 07-28-2011, 01:53 PM   #11
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and should I get the fixtures the length of my tank?
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Old 07-28-2011, 01:55 PM   #12
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Yes, absolutely.
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Old 07-28-2011, 02:01 PM   #13
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I'm gonna have to read a bit more on this before I start buying. Thanks for the help!
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Old 07-28-2011, 05:11 PM   #14
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PAR vs Distance, T5, T12, PC - Updated Again Charts

From this post, the second graph says that one T5HO lamp would be considered medium light for a 16" high tank if it was 4" above the top of the tank. So would this mean I would only need a single T5HO light for the scape im going for?
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Old 07-28-2011, 05:23 PM   #15
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I think you might have trouble getting dhg to thrive under a single t5ho. Low, medium, high light, it's all subjective. PAR is a good metric, but not the only determining factor.
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Old 07-28-2011, 05:32 PM   #16
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Well, if I got a duel T5HO fixture, how high would I need to put it to get the right amount of light?

would I need to worry about the light not getting spread to the whole tank?
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Old 07-28-2011, 05:45 PM   #17
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With a 2 bulb fixture, you can use the legs that come with most fixtures that will put it about 3-4 in off the surface. You could also just lay it on top of the glass, if you have a glass top. There are also mounting kits to suspend the lights from the ceiling should you want to go that route. Even if you lay it directly o. The top of the tank, if the fixture has even mediocre reflectors (most t5ho fixtures have individual decent reflectors for each bulb) you will get full coverage. Florescent bulbs, when properly reflected, are the best source for diffused lighting of an entire tank. MH and LED lighting is great, but you have to be much more mindful of "hot spots" with these types.
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Old 07-28-2011, 05:48 PM   #18
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Well going by that chart, a duel fixture 4" above the top would be high light, now with that wouldnt I need to start thinking about CO2?
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Old 07-28-2011, 05:52 PM   #19
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If you go by that chart, yes. My own personal experience would call that medium light, without a requirement for co2. Like I said, high, medium, low -- it's subjective. We try to inject as much objectivity and science in as we can, but it is subjective.
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