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Cultivated Reef

Cree LED lighting (again)


jm82792

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My friend and I want to buy the MR aqua 12 gallon long aquariums.

I want to do crees.

Are the XP-G a good idea for a tank that's 35X8X9.

I realize the XP-G have no optics but in a tank with these dimensions would ti work?

Are the becoming more available?

Do they have them in white and royal blue?

Can a buckpuck driver them at maximum capacity?

With such a shallow and long tank I'm thinking optics wouldn't be needed,

and I could go with a long and narrow heat sink.

Sorry for the questions,

I feel like this is the last time I'll be asking because I basically know all the other LED details.

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i wouldnt use a buckpuck since u need a DC power supply to run it.

they dont power as much as i like too for the money.

 

meanwell constant current drivers are very popular.

get the 60w 700mA version and it'll be more then enough.

 

u need to get some Royal blue or Blue XREs cuz like doctaq said xpgs only comes in white. for now.

 

u just have to set the array up in a long formation.

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yeah you probably will want the Cree XR-E's, because they come in cool white and royal blue. that is what the majority of people use for their LED fixtures

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Thanks guys for the info.

Dumb question what kind of coverage do I get with XRE?

Should I do a single line of them, alternating RB and white?

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Thanks guys for the info.

Dumb question what kind of coverage do I get with XRE?

Should I do a single line of them, alternating RB and white?

 

That is exactly what I would do.

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Thanks guys for the info.

Dumb question what kind of coverage do I get with XRE?

Should I do a single line of them, alternating RB and white?

That's what i did, i spaced mine about 2'' apart alternating each. I used only 8 led's, but my tank is only 8''x8''x10''

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davidncbrown
Thanks guys for the info.

Dumb question what kind of coverage do I get with XRE?

Should I do a single line of them, alternating RB and white?

 

This might be a little complicated but I think it's worth noting... It's interesting to see the intensity dropoff of the LED's... at about 40 degrees from the horizontal they are only at 60% of their intensity. The viewing angle is listed on the datasheet as 90 degrees for the whites. The LED's will spill out to almost a 120 degree angle, but only about 80 degrees of is is useful. You should keep this in mind when designing your fixture so you don't have points of high intensity and points of low intensity where the light emitted doesn't overlap. If money weren't an issue it would be better to have more LED's, closer together, and ran at lower power (to minimize heat issues) in order to be sure that the light is evenly distributed along your tank. I have seen some good LED builds on here where the light looks evenly mixed and you can't pick out the blue and white spotlights on the live rock, and then there are some where you can definitely see some spotlighting. This of course only applies to the bare LED's, not ones with optics. If you want to be thorough Just do a little trig to see how good your coverage will be. ;)

 

Of course if you light spotlighting then ignore everything I just said :P

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Thanks for the food for thought :)

I think I could rig it up in Blender using spotlights,

plug it in to scale and see where the overlap is and how good it is.

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