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Old 08-06-2010, 07:18 PM   #21
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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?
Im not using optics, I was suggesting them for a tank with a depth of more than 17in or so based soley on my observations. You may need more leds if you use optics with much less divergeance than a bare led.

You can work it out using some trig and the angle of the optic. There is also a chart somewhere on the net that shows the PAR of these leds with optics at different depths. I cant remember where I found it. Probably over at nano-reefs though.

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Old 08-06-2010, 07:58 PM   #22
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Optics? forgive me but the only optics I know are bino's,spotting scopes and rifle scopes.
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Old 08-06-2010, 08:04 PM   #23
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Optics? forgive me but the only optics I know are bino's,spotting scopes and rifle scopes.
There are lenses made for these high power leds that change the divergeance from 90-100deg all the way down to 40deg. This concentrates the led output.

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Old 08-06-2010, 08:36 PM   #24
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Ok isnt a 90 degree the optimal? I do not want spotlights that is for sure, I think with the 90 degree I can set them up as where there entire tank is lit, right?

How close to the tank does these have to be?
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Old 08-06-2010, 09:18 PM   #25
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It all depends on your tank depth. Mine are just a couple inches off the water in the 12in deep 7.5g tank and it may be too much light. In my 20g 17in deep tank, it looks like its not enough. You can always go without optics and then add them if you need them. They snap on over the led itself, so its no big deal to go without them except for the fact that having them on may require a tighter spacing. Im using 2in spacing from led center to led center within strings and and about 1.25in spacing between strings.

Id be more concerned with getting an even spread. Without optics, you could get away with 2.5in spacing within the string and 2.5in spacing between strings.

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Old 08-09-2010, 09:44 AM   #26
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I've been gone all weekend, trying to catch up on my subscriptions this morning. Matt is got you on the right track here though.

Im not sure how much you will need optics though. If it were a reef tank I would say yes, but since its a planted tank, I would think that if you covered the top adequately, enough light would mix down low to grow plants. I am talking off a very very small knowledge of planted tanks, but I don't think they use as much PAR as corals. I could be wrong.

Either way you could probably use 80 degree optics while still using 2 or 2.5in spacing without much spotlight effect.

If someone could find that PAR at different levels with different lenses, I would really like to see it.
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Old 04-03-2011, 11:57 AM   #27
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Got our tank a set of Blue LEDs, Just waiting for my brother too drop them off, Takes forever for him too remember to do anything lol
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Old 04-12-2011, 08:49 PM   #28
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Got my frist set of LEDs now they look nice I will have too get one more set....Sorry about the crappy picture.
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Old 04-12-2011, 09:00 PM   #29
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I just installed some DIY LED strips to augment my daylight standard fluor bulbs and to add lunar light to my 10G reef. Since I don't have a workshop at home, I didn't build it from scratch. Instead, I assembled parts and mounted them in the fluor fixtures. Cost was about $40 for 2X 20" strips and a dimmer.

Check it out: nanoreefung | Just another WordPress.com site
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Old 04-12-2011, 09:05 PM   #30
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The ones I got was like 6$ for the strip and power source so not too bad but my tank Is only a 10gal so dose not need too much....Do you have pictures???
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