Led light issues.

[ScubaSteve]

The problem you are describing is called colour separation and is due to the distance between the different colour emitters. Since the emitters (LEDs) of different colours are shining on the rocks at different angles, you end up with multicolour shadows and thus the rainbow effect. This is a fundamental design flaw that you can't do a whole ton about. Taking the lenses off makes the light less focused, which blurs the different colour shadows together a bit but there is another solution you can try. Look for a transparent, light diffusing film (slightly more transparent than a frosted film). This will help blend the colours together and give you a 'flat' light look like what T5s give. This will cut down on the output a bit, but you can turn the LEDs brighter to compensate.

[daplatapus]

Originally Posted by ScubaSteve

The problem you are describing is called colour separation and is due to the distance between the different colour emitters. Since the emitters (LEDs) of different colours are shining on the rocks at different angles, you end up with multicolour shadows and thus the rainbow effect. This is a fundamental design flaw that you can't do a whole ton about. Taking the lenses off makes the light less focused, which blurs the different colour shadows together a bit but there is another solution you can try. Look for a transparent, light diffusing film (slightly more transparent than a frosted film). This will help blend the colours together and give you a 'flat' light look like what T5s give. This will cut down on the output a bit, but you can turn the LEDs brighter to compensate.

+1 ^^^^^^

This is why you'll see the high end fixtures (Mitra's etc) and good DIY fixtures with really closely laid out LED's in clusters rather than an evenly spread layout.

[Mike-fish]

as to the light diffusing film scuba Steve mentioned you can get it at a theater lighting supply place. its sold as a light diffuser gel

[AdamsB]

I have a glass lid on the tank and I have noticed when there is condensation the light blends a lot better. Still not perfect, but better. If there is no condensation the light seems to actually focus more and I get spotting. Ill look into the diffuser route, that sounds like a perfect option. Which stores sell them? Sorry I'm not from canada and I have zero idea where to get it

[Mike-fish]

I deal with axe music in Edmonton they sell online too so that may work. Another place you could try is production lighting. There are several online stores that you can get it from as well

[nrosdal]

have you tried taking the glass top off to see if that is magnifying it?

when trying a light with exact layout i did notice the effect you speak of a bit but did not see the color separation at all (i did have it raised up about 7-8" off tank so that might be the difference).

Just to be safe i would see how it looks with no glass top to make sure that is not what is making the problem for you.

[AdamsB]

Without the glass top I get way more shimmer but also more colour separation. With the glass lid as long as there's condensation fogging it up the light blends more but is still noticeably separating. The light is at 8 inches above the glass so about 9.5 inches above the water line. I've tried covering the red an green which eliminates those colours from appearing but the 3d kind of look remains. Without any proper comparison it's hard to know what the problem is. But right now I'm more happy with the look from my 24 inch 2 bulb t5 unit (pictured)

[AdamsB]

So trying to find diffusion film online I stumble across this forum topic. I've ordered the same stuff he used. Coming from the states so I should have an update some time next week. Thanks everyone who commented

http://www.nano-reef.com/topic/29628...through-water/