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Old 01-09-2013, 09:57 PM   #141
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thanks mr X. your opinion is certainly valued. My concern is that they recommend hanging them about 10" above. If I do buy these fixtures for a glass canopy should I get the standard, 60 degree optics, or 90 degree optics? Does it matter?

PS I have a standard 75 gallon.
They recommend this so they dont get wet, it specifically states the fixture is not waterproof and should be hung at a safe level above the tank.
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Old 01-09-2013, 09:57 PM   #142
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It can sits on top of the tank like the marine land double bright or the one you linked. It also can hang it. I would always recommand people to hang their LED at about 6-10" above water level. That shouldprovide you the best even spread.
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Old 01-09-2013, 10:03 PM   #143
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Originally Posted by Psychocircus91 View Post
thanks mr X. your opinion is certainly valued. My concern is that they recommend hanging them about 10" above. If I do buy these fixtures for a glass canopy should I get the standard, 60 degree optics, or 90 degree optics? Does it matter?

PS I have a standard 75 gallon.

choice of the degree of the optic depend on your needs. smaller degree, provides strong focus spot light effect directly under the fixture. It has higher PAR /PUR due to the concerntration of the LED light beams. However, it gives up a lot of spread. Some people love how that can have spot light feeling with strong shimmering effect and doen't mind some shadow on the sides.
On the other way around, larger degree lenses will spread the light more evenly and can light up larger area, but you will have less PAR /PUR under the fixture. It would be up to you what you think about your tank. Afterall, it would be yourself and your family enjoy the aquarium, just like choosing kelvin of fixture, do you go with 14000K or 20000K, both would work, but might have different impact on viewing
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Old 01-09-2013, 10:38 PM   #144
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So ninety degree would give me a lot more spread than the standard? I think that would be better as the lights would be directly on the tank
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Old 01-10-2013, 12:09 AM   #145
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with no lens - its basically 120 degree spread

Add a smaller number optics - the 90 degree - will make the LED beam more narrow
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Old 01-10-2013, 02:52 AM   #146
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with no lens - its basically 120 degree spread

Add a smaller number optics - the 90 degree - will make the LED beam more narrow
So a larger degree actually has more spread? That makes sense.
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Old 01-10-2013, 05:02 PM   #147
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Just to add to those thinking about these units or the reefbreeders. There is a massive thread on reefcentral comparing/reviewing a lot of units.

Good read for those on the fence:

Chinese LED Lights - Reef Central Online Community
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Old 01-10-2013, 05:36 PM   #148
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I posted on RC. It might take forever to find my post. I would not be surprised it you guys took hours going through that single thread.
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Old 01-10-2013, 07:15 PM   #149
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I'm doing pretty good without the optics and reds and greens. My tank is 25" deep also. I'm curious to see what difference they (red and green) actually make.
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Old 01-10-2013, 07:45 PM   #150
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I'm doing pretty good without the optics and reds and greens. My tank is 25" deep also. I'm curious to see what difference they (red and green) actually make.
I wonder if your corals will actually notice any difference or maybe if your eyes will see the tank's color a little differently... Kinda interested in your results and ive grabbed a beer and settled into my chair in anticipation
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