Will these heatsinks be big enough

Nenno44

Well-Known Member
So I have been thinking about adding some color to my cob set up since the day I finished building it. For a little background info I have a 10 cxb3590 3500k set up. Its a 3-4-3 formation in a 36in by 36in frame in a 4x4 tent. I am planning on doing 4 bars of monos. I have about 9.75in between the cob bars to work with.

2 bars of 15 monos split between 3 colors. 5 cree xpe red-orange, 5 cree xpe reds and 5 cree xpe photo reds per bar all running at .5A.

The other two bars are going to be flower initiators with 4 cree xpe per bar running at .5A

I was wondering if adding the 2 color bars is worth it and if any of these heats sink profiles would be enough for what I plan on doing. These are what I am considering for the color bars; http://www.heatsinkusa.com/2-079-wide-extruded-aluminum-heatsink/ , http://www.heatsinkusa.com/2-425-wide-extruded-aluminum-heatsink/ , http://www.heatsinkusa.com/1-813-wide-extruded-aluminum-heatsink/ any advice on if these will work and what one would be best/sufficient would be really helpful. all of these at 36in

Then for the flower initiator I was thinking about http://www.heatsinkusa.com/1-000-wide-extruded-aluminum-heatsink/ . I know you can use aluminum tubing for this but a 36in length of this is only like 5 bucks and I can easily drive to heatinkusa, like super close to me.
 

pop22

Well-Known Member
You can't just guessitmate what you need for a heatsink. You need to calculate how much power your choice of leds will consume, how many you'll use, then calculate how much surface area you need on your heatsinks. There are guides on RIU that tell you how to do this.

So I have been thinking about adding some color to my cob set up since the day I finished building it. For a little background info I have a 10 cxb3590 3500k set up. Its a 3-4-3 formation in a 36in by 36in frame in a 4x4 tent. I am planning on doing 4 bars of monos. I have about 9.75in between the cob bars to work with.

2 bars of 15 monos split between 3 colors. 5 cree xpe red-orange, 5 cree xpe reds and 5 cree xpe photo reds per bar all running at .5A.

The other two bars are going to be flower initiators with 4 cree xpe per bar running at .5A

I was wondering if addy you will run, and useing the 2 color bars is worth it and if any of these heats sink profiles would be enough for what I plan on doing. These are what I am considering for the color bars; http://www.heatsinkusa.com/2-079-wide-extruded-aluminum-heatsink/ , http://www.heatsinkusa.com/2-425-wide-extruded-aluminum-heatsink/ , http://www.heatsinkusa.com/1-813-wide-extruded-aluminum-heatsink/ any advice on if these will work and what one would be best/sufficient would be really helpful. all of these at 36in

Then for the flower initiator I was thinking about http://www.heatsinkusa.com/1-000-wide-extruded-aluminum-heatsink/ . I know you can use aluminum tubing for this but a 36in length of this is only like 5 bucks and I can easily drive to heatinkusa, like super close to me.
 

ThaiBaby1

Well-Known Member
So I have been thinking about adding some color to my cob set up since the day I finished building it. For a little background info I have a 10 cxb3590 3500k set up. Its a 3-4-3 formation in a 36in by 36in frame in a 4x4 tent. I am planning on doing 4 bars of monos. I have about 9.75in between the cob bars to work with.

2 bars of 15 monos split between 3 colors. 5 cree xpe red-orange, 5 cree xpe reds and 5 cree xpe photo reds per bar all running at .5A.

The other two bars are going to be flower initiators with 4 cree xpe per bar running at .5A

I was wondering if adding the 2 color bars is worth it and if any of these heats sink profiles would be enough for what I plan on doing. These are what I am considering for the color bars; http://www.heatsinkusa.com/2-079-wide-extruded-aluminum-heatsink/ , http://www.heatsinkusa.com/2-425-wide-extruded-aluminum-heatsink/ , http://www.heatsinkusa.com/1-813-wide-extruded-aluminum-heatsink/ any advice on if these will work and what one would be best/sufficient would be really helpful. all of these at 36in

Then for the flower initiator I was thinking about http://www.heatsinkusa.com/1-000-wide-extruded-aluminum-heatsink/ . I know you can use aluminum tubing for this but a 36in length of this is only like 5 bucks and I can easily drive to heatinkusa, like super close to me.
The 2.079 is crap, dunno about the 2.4, 1.8 is good, but like he said you need to run the numbers.
 

Nenno44

Well-Known Member
So I guess a better question would be, does someone know the equation necessary to figure this out and willing to post it... Or does someone have a link to where I can find the equation. I have and I am trying to find it on here without much luck. Thank you for any and all help.
 

Nenno44

Well-Known Member
Thank you for that. Unless I am really stupid....which i am. I think the 2.079 at 36in would be over kill for 15 led running at 1.15w
 
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