Cob scribble
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I have a youtub channl i make my led diy to clu48. Soon. Vrro29. Cree $$$ for me. But pleezz like sub an follow me here an on youtub pleezz jonny c 2.0 grower lovehttps://youtu.be/tUw_uERIym4
Just watched YT video on HLGs new veg light kit for $99. Pretty damn cool
I want to build a system because so many of the commercial offerings seem shady (no pun intended) being made in China with little accurate data on the real CRI or brightness. I have lived and worked in Asia and have seen the lack of reliable data and the out and out lies on specification sheets or components used.
So, I see it costs about the same or slightly more to build one but the difference seems to be in the end you actually know what you have.
Thanks Again for the thread!
DP
Do it, you won't regret it especially since you already know what you're doing! The only downside I've experienced is that just like building a PC, as soon as you're done there's something better coming along.
My problem is not exactly a DIY, but fixing 3 piece of crap LEDs is not likely to be done by anybody other than myself.
View attachment 764548
The COBs started burning out in a few weeks, but after 19 months, only four of the original 15 COBs still worked.
Fans and power modules are still good but:
View attachment 764549
These things are toast.
Note that they are all wired red to negative.
Can this be the cause of the failure?
They look cooked.
Does this indicate that the thermal design is a fail?
I can't find any identification markings on the COB.
Is it worth replacing all 15, or is the thermal fail a design flaw that will just cook the replacements?
Any help is appreciated.
Thanks
I unplugged the driver from a broken lamp and plugged it into the working lamp.What are these "COBs" attached to? Is there a big chunk of a heatsink in there or just that thin metal sheet? Any kind of thermal pad or paste between the emittee and the mounting surface? Drivers are working properly? Can you rewire a driver from a toasted COB to a functional one and mesure the voltage and current? So tje same prior to rewiring? What does it say on those drivers voltage and current wise?
I unplugged the driver from a broken lamp and plugged it into the working lamp.
They all worked, so the drivers are all still good.
There is a smear of thermal paste under each COB base to an aluminum mounting plate. The fans blow on this plate.
Is the reverse wiring an allowed configuration?
These are my drivers.
View attachment 764552
View attachment 764553
Thanks
Thanks.The aluminum plate, how thick is it approximately? 3/16 or so? Just a plate, no ribs on the inside? The white paint, is it also beneath those cobs?
Drivers are 27-36V, 1.5A, so you could easily hook a 3590, vero7 or citizen 1818 instead of that chinese trash.But first get the thermal path and heat dissipation in check.
Thanks.
And the reverse wiring.
Any thoughts on that?
I will grind off the paint under the COB and put fresh thermal paste on.If they were wired reverse, they would have never worked.
Cheers mate appreciatedHeres Cutter Au. Website
U call dad for sure put some butter on that toastMy problem is not exactly a DIY, but fixing 3 piece of crap LEDs is not likely to be done by anybody other than myself.
View attachment 764548
The COBs started burning out in a few weeks, but after 19 months, only four of the original 15 COBs still worked.
Fans and power modules are still good but:
View attachment 764549
These things are toast.
Note that they are all wired red to negative.
Can this be the cause of the failure?
They look cooked.
Does this indicate that the thermal design is a fail?
I can't find any identification markings on the COB.
Is it worth replacing all 15, or is the thermal fail a design flaw that will just cook the replacements?
Any help is appreciated.
Thanks
View attachment 766224 View attachment 766225 View attachment 766226 Pictures:
-3 COB light bar
-Arctic 11 plus fan/heatsink
-Grow tent setup
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