COB itself cooler than heatsink? wtf

NEIN

NEIN

Member
When I touch my aluminium heatsink its pleasantly warm then when I (after quickly turning it off + washed hands) touch my cob the cob doesnt even feel warm.

Using 36.6V Vero 29 running at 1400 milliAs
 
NEIN

NEIN

Member
CobKits said:
its an illusion. as soon as you cut the power all the residual heat in the tiny chip gets sucked into the massive heatsink.
Click to expand...
How can I know that my cob is getting to hot? at full power the heatsinks get hot but still fine to touch
 
NoWaistedSpace

NoWaistedSpace

Well-Known Member
I am guessing it's a "Passive" heatsink? What type of 'heatsink"? Dimensions I mean.
I use up to 5 Vero 29 Gen 7's on 5.88x36" heatsinks from "Heatsink USA". I keep some kind of fan blowing in their direction and I never have a problem. I run 2 in "parallel" then pair them in series to match what driver I decide to use. Cuts my mA in 1/2 so more efficient and cooler. I run 8 Vero's off a Meanwell HLG 240 1400mA Each Vero gets 700mA for example. HLG 240 at 2100mA gets 6 at 1050mA each. You an get 2500mA from the HLG 240A(non dimmable)
You can get 312 watts pushing 3 Vero's. 104 watts each. But watts aren't what we are after. It's the PAR value. lol
 
Rahz

Rahz

Well-Known Member
The plastic package probably doesn't conduct heat as well as aluminum. Since it won't transfer heat as quickly it doesn't feel as warm to the touch.
 
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