Heatsinks for DIY LED lamps

Abiqua

Abiqua

Well-Known Member
Waiks said:
I want to run 6 vero 10's @350ma on a 32"L x 2.079"W H.USA.
I plan on placing two 50mm fans on top, one @ 8" the other at 24"
Would this keep the cobs cool? I want to lean on the overkill side of cooling.
Thanks!
Click to expand...
With active cooling @40cm/in^2 it will be good for just over 67 watts....

If extra cooling gets you down to 25-30cm/in^2 per watt all the better!!! but that will depend on a few factors...ambient, room size, active, semi passive, passive cooling, humidity, etc etc.....That's what testing is for :)
 
Waiks

Waiks

Well-Known Member
Thanks for the number crunching!
Looked at my plans again and there will be 7 vero 10s on each bar which equals 63w.
Once it's built I'll test it out and if needed, one fan will be added on top.
Three fans mounted above the sink blowing downward should be nice overkill :D

Sinks and cobs ordered! Now just need to find the right driver.
I've got an HLG-120H-C350B in my cart right now. Looks good yes? :D Will be at around 84% load but according to the data sheet that should push 90% efficiency still.
 
qwerkus

qwerkus

Well-Known Member
@nug jug All depends on screw quality. Sometimes it's so bad, you need 3-4 of them to make do the tapping. I would take good quality stainless steel right away - works great. Remember to go slooooow. Like a turn per min max.Torx helps during tapping: better hold.
Color temp is widely discussed here. Depends on chips. For cree there seems a consensus about 5000k or more for vegging, and 3000k or 3500k for flowering. Some (like myself) do everything on 4000k - but I don't grow weed.
About the driver, you need a constant current one. Best to go with one driver per cob, there are some cheap ones on ebay. If you want only one driver to power all chips, better get a good one. Meanwell drivers are proven to be of good quality. Remeber to add voltages if mounted in series: to power 2x 36V cobs, you'll need a 72V driver, and so on.
 
Last edited:
Waiks

Waiks

Well-Known Member
I'm not sure if I understand the math...
2in x 32in heat sink is 64 sq.in..
which is 412 sq.cm
divide that by 25 because I will have fans on top..
and I get 16.48.
How'd you come up with 67 watts?
I am clearly doing something wrong lol
 
littlejacob

littlejacob

Well-Known Member
Bonjour
I guess you can use vero10 in parallel...like Bueno grow...If I remember correctly he have 35 V10 on an hlg-185-500b....
But if you want to stay cheap use driver from Aliexpress!
Have a great day ★
 
Waiks

Waiks

Well-Known Member
Thank you for the reply Jacob. Bueno's grow is what inspired me to use the vero 10s. I have an hlg 120h 350b on the way to power all 14. It is a 150w driver and the cobs equal 126 watts. If i had more to power I'd probably go the parallel route.

Do you know off the top of your head what profile sink he used? I'm concerned I may not have enough overkill cooling. I don't understand the math completely on calculating required size.
 
Abiqua

Abiqua

Well-Known Member
Waiks said:
I'm not sure if I understand the math...
2in x 32in heat sink is 64 sq.in..
which is 412 sq.cm
divide that by 25 because I will have fans on top..
and I get 16.48.
How'd you come up with 67 watts?
I am clearly doing something wrong lol
Click to expand...

This is the way I calculate.....the 2.09" has 84.34 cm^2 for every Inch of heatsink..... [Note this can also be calcuated per every CM of Heatsink too] .........2.54 centimeters = 1 inch.

32 [inches] x 84.34 [cm^2] = 2699 cm [2698.88]

Taking into account Supra's past recommendations....40 cm for active cooling, 110cm's for Passive cooling....

2699/ 40 = 67.675 Watts.... Active
2699/110 = 24.5 watts.....Passive

I would start with one fan @12v centered on the heatsink and see how much cooling that applies in your situation....Adding two fans, might not be all that better than 1 to begin with....just thinking out loud :peace:
 
Waiks

Waiks

Well-Known Member
Ahhhhh there it is. Thanks! I figured I was doing something wrong in the calculations haha.

Interesting point. I will test that!
If it doesn't work out, I can install it onto a piece of wood. Fins flush with the wood and cutouts for the fan. That should work as a wind channel of some sort correct? I have seen similar but should I allow a small gap between the fins and the wood or have it directly against?
Thanks again! :clap:bongsmilie
 
littlejacob

littlejacob

Well-Known Member
Bonjour
If I remember correctly he didn't use hs from hsusa...he made it with a piece of aluminum people use to work with...mason rule I guess...he have lots of tools...
Have a great day ★
 
organic-fanatic

organic-fanatic

Active Member
I like the idea of using the cpu coolers & cob holders, for flexibility.
and i'm also sold on the cxb 3590's to get max efficiency. Is this possible?
If not, what would be the next best match? Thank you in advance for your reply's.
 
Stephenj37826

Stephenj37826

Well-Known Member
organic-fanatic said:
Thank you, I will be building out (4) new 18 x 80 (scrog) cabinets just for this diy led project, to simplify my grow and maximize efficiency, everything will now be with in a arms reach as i stroll down the row in a chair on wheels.
Click to expand...
What's your plan for layout? 4 cob over each space?
 
Stephenj37826

Stephenj37826

Well-Known Member
organic-fanatic said:
Either 6@50w or 12@24 3590's, maybe even a smaller cob will work. Not sure yet, i need more information about how these cobs disperse light. I do know i would like them to be no further away than 18 inches from the canopy.
Click to expand...
5 would fit hlg240hc1400a or 6 would fit hlg240c1050a. I think 6 at 1050 would give you a great gpw scrog style.
 
littlejacob

littlejacob

Well-Known Member
organic-fanatic said:
Thank you, I will be building out (4) new 18 x 80 (scrog) cabinets just for this diy led project, to simplify my grow and maximize efficiency, everything will now be with in a arms reach as i stroll down the row in a chair on wheels.
Click to expand...
Bonjour
18X80...inches...cm...?
And why 18x80 and not 50x50 or a square?
If it is inches you will need more watt per plant if it is cm less...
Have a great day ★
 
You must log in or register to reply here.
Top