Heatsinks for DIY LED lamps

bobbuck

Well-Known Member
Hey Bobbuck!
Take them to the scrap yard! You get money for it and scrap yards are a good place to find better suited heatsinks than this! Found 8 of these 9,84" x 7,87" x 1,57"(250x 200x 40mm) bad boys and got them for only 35 bucks.
Scrap is what I was thinking . I'm going to keep a few to try and set up a 45w Vero 18 veg/clone light and take some temps and see what happens.
 

Randomblame

Well-Known Member
The heatsinks look similar to what I use for my lights.
My HS are 8"x8"
What does the led show...voltage?
Temps in °C or Tc. of the heatsink right behind a cob.
In one of my other builds I've an additional ampere/voltage meter.
 

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Randomblame

Well-Known Member
Very nice on those lights. I'd love to make such nice ones myself
That's not so hard you maybe think.
You can buy these already color lacquered aluminum c-channels from a metal web shop according to your own specifications and then cut the holes out you need using jigsaw. Then drill a few holes for dimmer knob, fan and driver, glue-in the thermometer and connect the wiring. The hardest part is to sawing out precise holes!
 

Randomblame

Well-Known Member
@Randomblame the fixtures you make are awesome dude!
I really want to make something close in function and looks to them.

My diy lights are fully functional, but very rough looking in contrast
Thanks bro,
But you do not want to see my first build...
CPU coolers, aluminum rods and cable ties, lol!
So ugly, that I've put myself ashamed in the corner.
 

BuddyColas

Well-Known Member
Thanks bro,
But you do not want to see my first build...
CPU coolers, aluminum rods and cable ties, lol!
So ugly, that I've put myself ashamed in the corner.
Hold on a minute! Stop the press! You're being to hard on yourself. You're talking about ty-raps, aluminum rods (you left out pvc pipe and duct-tape and bailing wire) like there are bad things? A pile a buds safely grown trumps beauty every time!:hump:

And did I forget Kapton tape and RTV sealer?
 
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HalfBee

Well-Known Member
But you do not want to see my first build...
CPU coolers, aluminum rods and cable ties, lol!
So ugly, that I've put myself ashamed in the corner.
So true... first builds are supposed to bee fugly if you aren't doing it from a kit.
Finding out what works and testing/salvaging parts is only part of the problem.
Using skills outside your comfort zone (power tools), having disabilities, and such
almost guarantee it won't look perfect.

Spent uncounted hours doing Cob/heatsink combo calculations - so happy I got it right...
 

secretz

Active Member
Hi, I'm doing a build, have watched growmau5's videos and calculated a suitable heatsink. Would someone confirm that this heatsink is suitable for two 36V cxb3590s? Active cooled with 1 or 2 120mm computer fans.

edit: It has 2306 square centimeters of area
 

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Voidling

Well-Known Member
Hi, I'm doing a build, have watched growmau5's videos and calculated a suitable heatsink. Would someone confirm that this heatsink is suitable for two 36V cxb3590s? Active cooled with 1 or 2 120mm computer fans.

edit: It has 2306 square centimeters of area
How many watts do you plan to run on the cobs? Full power, 40%, something in between? The heat sink doesn't care the source so much as to what the full load is in watts.

I'm not sure the numbers they're using now, used to be 110cm2/watt which would be 20 watts of led. I think that was passive. I'm going to find time to catch up on new info
 

secretz

Active Member
How many watts do you plan to run on the cobs? Full power, 40%, something in between? The heat sink doesn't care the source so much as to what the full load is in watts.

I'm not sure the numbers they're using now, used to be 110cm2/watt which would be 20 watts of led. I think that was passive. I'm going to find time to catch up on new info
If my calculations are correct, it'll be 56.34% efficient so 21 heat watts per cob I think. I'm using Mean well HLG-185H-1400B driver to run 3 or 4 cobs.
 

bassman999

Well-Known Member
I run between 30 and 40 watts per cob during flowering using (2) HLG-240s and 12 cobs in a 2x4 (8ft^2) tent.
So 1.5 cobs and 45-60watts per ft^2.
Overkill, but makes up for my small space and only average skills

I run between 21% and 29% of max output flowering and about half that vegging
 

rocho

Well-Known Member
Hi...if alpine11 is a little smal for vero29 what about artic64?would it fit better? And artic m1 passive?

Peace!!
 

muleface

Well-Known Member
DP, that gives you 4550cm² so at 110cm²/W, it would be good for about 40W of dissipation. So that would be (2) Vero 18s at 700mA.

In this case, if you added an 80mm or 92mm fan and ran it a 9V, (~2W) it should be sufficient for 115W, plenty for (4) Vero18s at 700mA.
so is 110cm2/w for passive cooling? does this scale out pretty well, so a 20 w cob would need 2200 cm2 and a 100 w cob would need 11000 cm2?
 
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