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#1
01-15-2013, 04:00 AM
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DIY LED help
I'm having a hard time understanding how to decide the number of LEDs needed for a diy fixture. There are lots of formulas floating around for it but it seems most people end up dimming their fixtures way down around 50% which leads me to believe they could have gotten away with less LEDs.
From what I gather the formula for figuring out the light spread is tan(degrees)*distance. When I do the math the diameter of the beam is huge even with 80 degree optics. I found an online calculator that says with 80 degree optics the beam is 13.43" only 8" from the bulb and 33.6 at 20". Does that seem correct?
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72g bowfront, t5. 29g JBJ nano cube, ATI 26HD. Livestock: clown fish, chromis, coral beauty. Corals: Toadstool, maze brain, candy cane, mushrooms (purple & green hairy), button polyps, green zoas, GSP. 
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