Going for it..LEDs !!..Questions on heatsink?

Well I was going to order new halide bulbs,BUT Today is my Birthday and my wife surprised me with the the OK to go LED..WooHoo;D..ok going with the rapid 48 ultra premium kit and 8 xp-g neutral white and 4 ep-g royal blue 9 (as Evolved did) all will be on dimmers..
They will be in a canopy or hung(not sure) but either way im looking at approx 8-12 inches above tank...Im having trouble picking my heat sink size..should I go with three 5.9"x10"front to back..or two 5.9:x23# long way OR what ever you suggest..im lost deff need help so I can place my order...Thanks..

Tank is a 72 bowfront with mostly LPS some softies and some SPS,and a clam..

 

Bump fell off the radar..

 

well just an update...waited for some responses here but no one bit..soo e-mailed Rapid Led and they were quick to respond..they say 60 Leds over my tank s waaaay to much,they rec 40-48,and gave some good suggestions on heat sink layouts for bow fronts...but im still open to any suggestion from you Led peps out there...also order is going in, in prob an hour or so...woohoo

 

Did you pm evolved? He is the LED guru round here. I know after talking to him and few other sources I was recommend two 6-7" x 18-20 heatsinks. So I would imagine anything around in there should be ok.

 

Nope didn't even think about that.good idea..for the last hour or so I've been playing paper cut outs for comparison..I think I may go with the 5.8"x16" x2... with 24 on either side of my brace approx 8-9" off water...

 

I went with 40 leds for my 60 gallon. i did 2 of the 5.8x16 inch heat sinks, 20 leds on each.

 

sounds good,got some pics..how do you like it so far??
also what are your tank dimensions..

EDIT..I found your LED build gonna read it ...thanks..

 

Am I too late?

If you PM me, I'll get an email pushed to my phone, I typically get back to PMs pretty quickly...

Anyhow, tattooedsoul's suggestion is valid; if you wish you could go wider (and order from heatsinkusa.com). Going a bit wider will allow you to space out the diodes a bit more, and allow you to hang it closer to the tank surface.

 

Thanks..I was going to PM you but after tattooedsouls suggestion and playing with mock ups above the tank. I felt comfortable going forward with the order..
I did order from heatsinkusa,I went with the 5.8"x17" x 2..any wider and I would get wasted light on the overflow side..I already have 12cree royal blues on a 48" rule that I was using for actinics so it already gave me an idea of height/spreed.. also I only went with the 48 ultra premium(XPG) dim kit per rapid..but with the 17" heatsink I will have room to add moons and if I need be warm whites (like you did) later on..Thanks for the help..I may need you when hooking up the pots/dim ballast..

 

Sounds like a good plan.

You know how to reach me, if need be. Don't be shy.