stupid question on cheapest heatsink ever (flat plate)

PhotonFUD

PhotonFUD

Well-Known Member
CobKits said:
well i was thinking of it as take a 5x5 tent and cut yourself a 4x4 sheet of 1/4" aluminum (3 lb/SF so not ridiculous). you now have an unlimited template workspace to put rows of cobs, monos, far reds, etc etc. normal airflow circulation in there blowing on it, maybe a fan up top above it blowing across. put the money into chips instead of thermal management. use (4) smaller, cheaper 28mm 10 W cobs on 6" centers vs 40W 38mm cobs on 12" centers, which would result in more even heat transfer. heck you could even snake a ghetto water cool line across the top without any direct physical contact to the chips
Click to expand...

Why? So you could run 80+ cobs at 3w each of course.

Totally passive thermal management is the goal. Uber under driven as you put it.

I have a few cheap chinese fixtures that I am going to use as the controller to house the drivers. Going to get a 3x3, 1/8" aluminum sheet, mount controller to top side, cobs to bottom side. Polish up the light side, scuff up the top side. I also have a street sign that I may frankenstein as well.

I don't expect to have any warpage issues but plan to use a white water noodle around the aluminum edge for safety.
 
Kevin the Great

Kevin the Great

Well-Known Member
Random thought. You could also set heatsinks on top of the plate with thermal adhesive. Easy to get the proper heat dissipation when you can randomly place random sized heatsinks that you can scavenge from random places.
 
bobbuck

bobbuck

Well-Known Member
So I just found a bag of these while waking the dog. they're 12" long 5" Wide base plus 3" (the thing on the side) and 1/2" thick. the top side of the main base is serrated maybe 1/16 -1/32 tall fins. wondering how I can use these as COB heatsinks. Not Sure how the thickness would come in to play when trying to calculate. any input on what people think would be awesome. thanks
 

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mauricem00

mauricem00

Well-Known Member
seems that using a large number of 3 watt leds would provide a more uniform footprint and allow the light to be placed closer to the plant.
 
mauricem00

mauricem00

Well-Known Member
bobbuck said:
So I just found a bag of these while waking the dog. they're 12" long 5" Wide base plus 3" (the thing on the side) and 1/2" thick. the top side of the main base is serrated maybe 1/16 -1/32 tall fins. wondering how I can use these as COB heatsinks. Not Sure how the thickness would come in to play when trying to calculate. any input on what people think would be awesome. thanks
Click to expand...
http://www.myheatsinks.com/calculate/thermal-resistance-plate-fin/ this online calculator may help
 
ChaosHunter

ChaosHunter

Well-Known Member
why not take short sections of aluminum angle and line them up next to each other on the plate to make one big heat sink ?
 
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