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Harm Reduction Notes for the COVID-19 Pandemic

Custom Grow fixtures

- Wed, 09 Mar 2016 22:13:26 EST TFJzyOuA No.37856
File: 1457579606626.jpg -(3492859B / 3.33MB, 4160x2340) Thumbnail displayed, click image for full size. Custom Grow fixtures
I was wondering if you guys had any good sources on custom grow setups?

Led's preferably, pictured is mine.

It's a 400w fixture.

A 36v 12a power supply for cctv systems.
wired in parallel to 2x 250w and 1x 150w buck converters, for constant current.
The converters are wired in parallel to 3 per 250 and 2 to the 150.
50w cob chips of course, working at 35v 1500ma each.

Parts hit about $250 if you include some of the tools I had to buy. (but should have had in the first place.

Pulls 470w from the wall, I'll be testing it's ability to grow in a 4x8 area next to its brother when it's finished.

Here's a helpful link to some led stuff.
Charlotte Honeyfuck - Thu, 31 Mar 2016 02:56:53 EST EwyhM+PY No.37878 Reply
That looks like it runs hot as hell. No wonder you're having parts fail on you.
Sophie Gecklemat - Thu, 31 Mar 2016 09:49:31 EST TFJzyOuA No.37879 Reply

I haven't had anything fail yet. I just wouldn't trust it in a situation where my income is dependent on it working all the time. Seeing as I'm just a hobbyist, and it's my first build it's doing fine.
Whitey Hivinggold - Sat, 09 Apr 2016 07:11:47 EST Qtz16c4F No.37889 Reply
Is this even a real heatsink with cooling fins or just some aluminum plate?
You are aware that LEDs even work when they are overheating, but their lifespan is drastically reduced. They also have abysmal performance when they get hot. Your 50000 Lumen might turn out to be 30000 for a few weeks.
Whitey Hivinggold - Sat, 09 Apr 2016 07:13:26 EST Qtz16c4F No.37890 Reply
Also good riddance if you payed more in parts than a 400W HPS fixture costs.
Charles Bevinghere - Tue, 12 Apr 2016 10:23:03 EST xDaS0dhy No.37892 Reply

They are mounted to CPU heat sinks mounted to 3"x8" ducting. 2x 120mm fans pull air from the running CPU fans through the fins. all powered by one 12v 2a power supply.

Heats not a problem, I could hold my fingers against the heat sinks after a 12 hour fire test. its average time on is 16 hrs a day so far, and nothing has started failing yet.

Flat aluminum would never have the heat dissipation to even run one 50w cob.

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