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Old 08-06-2010, 03:36 PM   #11
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you can get led tubes to retrofit the T5 and t8 fittings as well
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Old 08-06-2010, 03:54 PM   #12
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Good point about tank size. My led light fills the 7.5g tank with light but would need optics and double the leds/size to have a shot at my t5 setup on my 20g. I held it over the 20g and was really dissapointed. Im guessing with optics and at least double the leds it might work, but probably not as well as my t5s...

You really want to know what you are doing before risking $200.00 worth of leds. My hand slipped while connecting my whites to their driver and instantly fried all 4. Thats $24.00 plus shipping mistake right there.
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Old 08-06-2010, 04:05 PM   #13
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Currently the best way to judge leds is by surface area. 1 3w led per 12in^2 is very high light, 1 per 18in^2 is high light and so on (of course this is an estimate, but par values for leds are so high.) Also another thing to consider is you need enough leds to prevent spotlighting in the tank.
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Old 08-06-2010, 05:12 PM   #14
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Krap is that 12" and 18" squared?

My surface area is 12 square feet I believe, its 6' W by 2' deep. and these retro kits for the T5 and T8's are where?

My wattage now (not that it matters with a tank that size ive been told) is 640W for 6 hours and 320W for the other 4, I do this to create a midday intensity.
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Old 08-06-2010, 06:27 PM   #15
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So, that means you have 1728 in^2, so lets use the 18 in^2, you'll need 96 leds, assuming your tank isn't too deep.
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Old 08-06-2010, 06:34 PM   #16
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30" deep. How do LED's do for planted tanks? Do they have what we use?
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Old 08-06-2010, 06:38 PM   #17
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Leds have about the same lumen per watt as t5ho, but have a ridiculous amount of par, which is what plants use. I'm not sure if its the same for saltwater as fw, but in sw, people's corals were bleaching because of how much light (par) was put off. Lumens are what we see, and lux/par are what is actually put out.

30" you should be fine. Again, it depends on what leds you use, how you run them, but also, leds are still pretty new, so it's likely you'll have to turn down your leds, once you're done I think. I'm not sure at what point you'll need optics though. My 29 is 18" deep, and my 10 is... lol... 12" deep
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Old 08-06-2010, 06:44 PM   #18
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Id suggest optics for a 30in deep tank. My 20g is 15in to the sandbed and my 12 led light didnt look to be penetrating like the t5s do.

I guess I have a very high light output light. 144in^2 and 12 3w leds...My zoanthids seem to like it, but the acans and chalices do NOT. Ive got the blues at 50% and the whites at 30%.

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Old 08-06-2010, 07:03 PM   #19
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yeah my T5's penetrate the substrate about 2 inches.

Krap, thank you I will start looking for 3w led's and start adding up the new damages lol
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Old 08-06-2010, 07:13 PM   #20
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Since I guess you're using optics, it would seem that you'll need to add more leds to prevent spotlighting?
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