| | |  02-23-2011, 09:05 AM Quote: Originally Posted by that Reef Guy Why do you have to hang it? I thought you only had do that with Metal Halides? I read that LED's do not give off any heat.  | you hang them to get better spread of the LED, no they will not add any heat to the tank. since LEDs are a beam light at say 60 degree (optic) you need to put it up high enough to have good overlap of the LEDs so your light coverage is increased. if you used no optics you could get away with a few inches above the tank, or if you wanted it right on the tank you would have to get more leds and spread them out to get better coverage. they are a beam light rather than an ambient light such as t5's. halides are also a beam light but with the large bulbs and reflectors it helps put them in between a beam and ambient light system. |
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