cxa 3070 bin question

Humanrob

Humanrob

Well-Known Member
OK, I feel bad because people are going to click on this and I've wasted precious seconds of their lives... so I'll ask another question I've been thinking about.

How hot do the heat sinks get? I believe I've seen cobs mounted in plastic fence posts -- has anyone used wood to mount the heat sinks to?

I have a metal miter saw, but I've read that cutting aluminum will clog up the wheel. I'm also very familiar with working with wood, and would be just as content to build a frame from oak 1x2's as I would building it from aluminum bars or angles. Any thoughts?
 
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Humanrob

Humanrob

Well-Known Member
sanjuan said:
The plastic fence posts have CPU heatsinks inside and fans at the ends, I believe. Wood makes a terrible heatsink.
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I didn't want to use wood as a heatsink, just a place to mount a heatsink. But I can see that wood would trap the heat, while aluminum would conduct and disperse it. I get it. I'll stick with aluminum.
 
Abiqua

Abiqua

Well-Known Member
Humanrob said:
OK, I feel bad because people are going to click on this and I've wasted precious seconds of their lives... so I'll ask another question I've been thinking about.

How hot do the heat sinks get? I believe I've seen cobs mounted in plastic fence posts -- has anyone used wood to mount the heat sinks to?

I have a metal miter saw, but I've read that cutting aluminum will clog up the wheel. I'm also very familiar with working with wood, and would be just as content to build a frame from oak 1x2's as I would building it from aluminum bars or angles. Any thoughts?
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Its a good start....I say cutting metal is easier than wood, but the tools are pricier......The miter saw won't bind with a good carbide blade....I have cut granite before with cheap harbor Freight mitre's.... :peace:
 
sanjuan

sanjuan

Well-Known Member
Oh, for a framework, wood would work. But as you say, Humanrob, aluminum can be used to good advantage thermally. I think I'll add some thermal grease between the structual aluminum sheet and the heatsink extrusion of my next build. If making a single luminaire, a hacksaw works OK on the aluminum angles and channels we can get from the hardware store (if you have a good way to clamp the workpiece).
 
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Tim Fox

Tim Fox

Well-Known Member
if I rememberr right, wood will also soak up humidity and other things and could ad to mold?, potentially?,, but if you sealed or painted the wood, i bet it would be just fine, I heard that single HLG-185H-C1400B gets pretty hot with this set up, i wonder if it gets hot enough to damage the wood, i really really doublt it, as it would also burn your hands
 
Tim Fox

Tim Fox

Well-Known Member
Humanrob said:
ooooops.... never mind, I figured it out. :)
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you could also purchase a single hack saw blade and grip it with a towel on one end, the aluminum frame from home depot is pretty soft and cuts and drills really easy,, to me it did anyways
 
Humanrob

Humanrob

Well-Known Member
Thanks everyone, you're all very supportive even when I'm only running on half my cylinders. ;)

It was a little confusing digging through the old threads on CXA 3070 builds, because they go back to early 2014 and I couldn't tell if the information in terms of BIN #'s had changed. It seems like it all still lines up though.

People said building COBs would be addictive, apparently I have an addictive personality because all the parts for my first build haven't even arrived yet and I'm already designing lights to supplement it. My first one is the basic (4) cxb3070's (CXB3070-0000-000N0HAB30G) running off of a single MW HLG-185H-C1400B. Now I'm thinking about a pair of 5000k COBs to run alongside that light during veg, with the 3000's dimmed. Then during flower I can either run them both at full or switch off the 5000's and turn up the 3000's. I wasn't able to find CXB's in 5000k, either 3070 or 3590, so it looks like I'll be using a pair of cxa3070's. I'm trying to muster some discipline and wait until the first one is done before I order the parts for the second one. That could happen.
 
Tim Fox

Tim Fox

Well-Known Member
Dude you need to come over to the budget cob thread, I'll get on the PC and link you, they are posting these cree,cxa for as cheap as five bucks, but they are slightly lower lumen, and they are 5000 k
 
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