100W COB Active vs. Passive Heatsinks

[nacmonad]

So all these diy builds are going for the Optic 1 XL spotlight designs, with the large 180mm (or 150mm on the 54W builds).

These heatsinks are expensive af -- >$50 for the 180mm if you want to passively cool a 100W COB.


Has anyone used the active coolers? Plain ol' CPU + fans?

I'm thinking of using
https://www.ebay.com/itm/20-100W-LED-Al ... 2902502808

and tapping and mounting the standard 2303 Ideal Holders, and possibily using the optics provided.


as for power, I'm thinking of using 709-HLG-480H-36 -- Constant Voltage driver as i want my rig to be :
-modular
-expandable up to 4x100W

I must know if the cheap, active aluminum coolers will prevent thermal runaway?
What is the risk of the a fan breaking and causing thermal runaway?


The active cooling/single driver provides savings of >$300 as compared to building a 4xOptic 1XL clones.

[nacmonad]

also looking at https://www.cree.com/led-components/med ... XB3590.pdf
according to the relative luminous-flux diagram,

if active heatsink, and can run about 20 degrees cooler -- can get 5-15% more output

if the actives run cooler, they offer a lot more advantages than just cost...

[nacmonad]

sad news folks ---

i got in touch with a friend who will lend me a 650W or 1000W HPS (has them in the multiples)
i'll just buy a new bulb.

due to these cost savings, i will have to postpone this prospective COB build -- who knows, maybe there'll be better tech in 3 months :/


i do have a viparspectra450 i can COB out so could do a DIY build with that.