Is it possible to over cool COBs? Liquid cooling

Hadez411

Hadez411

Well-Known Member
ApfelStrudel said:
Those normally go for about $28 but since they are AMD Athlon heatsinks that have been off the shelfs for ages you can source them really cheap. And those were the only ones I found that made mounting a walk in the park

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Do tell about your light coverage. I like the look of your cobs and smd.

So I'm unable to find those last gen heat sinks or any others, especially because I haven't researched them in the last decade. Do you have any suggestions? My only idea is to be a hawk for clearance sales on cpu sites.
 
Hadez411

Hadez411

Well-Known Member
1212ham said:
My 180w strip light wasn't difficult or expensive. I TIG welded 1/2" square tubes to 1/2" square headers, bought an $10 pump off eBay and used a plastic tote for a reservoir.

I also tested a Citizen COB at 250W on a $6 CPU water block . With good water flow, junction temp was only slightly higher than water temp. Voltage would stabilize in a less than a second after power on.
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How much is good flow?
 
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1212ham

Well-Known Member
Hadez411 said:
How much is good flow?
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Hard to say, I lost my notes. The CPU water blocks I have use 8mm or 5/16" hose, so it's not a lot of water.

Have you calculated the possible cost savings of increased efficiency? As others mentioned, the best reason for water cooling is moving the heat, not saving electricity.
I water cooled my strip light because I wanted to and I was easy for me to do so, plus it's a way to remove heat from the tent.
 
Hadez411

Hadez411

Well-Known Member
1212ham said:
Hard to say, I lost my notes. The CPU water blocks I have use 8mm or 5/16" hose, so it's not a lot of water.

Have you calculated the possible cost savings of increased efficiency? As others mentioned, the best reason for water cooling is moving the heat, not saving electricity.
I water cooled my strip light because I wanted to and I was easy for me to do so, plus it's a way to remove heat from the tent.
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After some consideration on increased efficiency vs. the rate of LED advancement, I figured cheap and easy is best.

Depending on the time of year, taking heat outside would be nice though and in the winter the coolant would be frigid and just give me some free LED efficiency. The area I grow in is an old barn and it does a good job at averaging out the high temperature swings, but if i start ventilating a lot or heat sinking to the air in the room, it'll negate the benefit. I'm also getting setup with aeroponics, so I'll already be doing a lot of plumbing and running line anyhow.
 
Hadez411

Hadez411

Well-Known Member
Chip Green said:
After many, many hours of consideration of the question in the title of this thread, I have concluded that it is possible to over cool a COB in a liquid cooled setup, using liquid nitrogen.
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Haha ya, someone said early on that a high flow, cold water cooling system can cause condensation on the cob surface. So thats too much imo.
 
A

ApfelStrudel

Well-Known Member
Those 64 lp sinks aren't such beasts compared to the 64 plus. You'd have to drill some holes in the plus tho. You can still try sourcing those sinks and might get lucky. Lime I said, it took me a few months to get them that cheap
 
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