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Putting perfectly good heatsinks inside a box is like jumping out of a perfectly good airplane. Thermal management is key, not aesthetics. Heatsinks should be out in the open where they can catch a breeze.

Those sinks have no fins in the middle. robin, please share your findings about temp variances across the QB.

I have to admit some skepticism about transfer of heat to a heatsink. I've played around with computers and COB's and thermal paste. Good transfer of heat relies on solid contact and a thin layer of TIM helping out where the surfaces aren't in direct contact. I don't have one of these QB's...

taita, you seem to have some ideas in your head about heatsinks that aren't reality-based. Layering another heatsink on top of the first isn't going to help at all. The big factors are: 1) the heatsink's contact with the surface making heat (the more direct contact, the better the transfer of...

You might get a better response in the Stealth/Micro/Cab Growing forum. It's right next to this one in the Main Forum menu.

Parallel isn't difficult. That's not the issue. Parallel wiring exposes you to a potentially catastrophic situation called thermal runaway. Apparently you can put more stuff into your circuit to guard against runaway, but why bother when series wiring guarantees that thermal runaway won't be...

I started out with a half dozen CXA3070's a few years ago. I had computer parts laying around, so I bolted them to CPU heatsinks. I ran my CXA3070's at 700mA. The 3070's produce about 27W at 700 mA. All of the CPU heatsinks I used were at least 3X as robust as yours. And the fins were the...

- Series is safer than parallel. Stick with the statistically safer method. I don't know which driver you need, but as CobKits said, you have to start with that Primary Output Voltage of nearly 150V. - It's inadvisable to use the same color of wire throughout the project. Take a look at how...

Thanks again And the little resistor should be at least 1/4 watt.

Thanks, Mr. Dawg. I appreciate your suggestion. According to the spec sheet on Mouser, the HLG-320-1400"A" is adjustable thru a range of 700 - 1050mA. That would probably be good enough for me. The "B" series requires a couple of pieces of wire and a potentiometer to adjust, right? And you...

Good morning! I'd like to ask for some peer review. I have six CXA3070's bolted to a hodge-podge of PC coolers, each with its own small driver and fan. Time to dismantle & start over again. I want to run them passive. And with one driver (in series) instead of a half dozen. A Supra...

Start to finish. I'm aware that many folks believe cooler for veg and warmer for flower. I thought that too but seems like lots of successful grows with just one spectrum.

Timber kits available in 3000K, 3.500K, 4000K and 5000K. Any thoughts on best spectrum?

Good morning! Replacement fluorescent tubes are becoming a big deal in the LED world. There's a huge potential market and I wonder if growers could take advantage of the activity in this space. At Amazon one can buy 4 ft. Hyperikons at 4000K and 5000K. These tubes are claimed to be at least...

After Finicum jumps out of the rig, a guy comes out of the woods from the left. He's holding something long and crooked. That's not a gun, is it?

From RobRoy: Funny that you take the opinion of a Federal Prosecutor as gospel. Well, yeah, vs. Fox News or some inbred ranchers. Let me guess - you watch Fox News. Have you ever burned anything illegally (gasp!) that never harmed anybody? Yes, I have. I've set two grass fires (many years...

I see now why there's been some confusion about burning. That's because the Hammonds were caught illegally burning more than once. I quote from Wikipedia: Dwight and Steve Hammond were convicted of arson in 2012 for setting fires on federal land adjacent to their property near Burns in 2001...

First off, you can't garuanteeyew that the grass grew back greener. You want to think it did. Second off, a quote from CNN: "Prosecutors said the Hammonds set a fire that burned about 130 acres in 2001, to cover up poaching. They were sentenced to five years in prison." Poaching. Not...

What do you guys think of these LED light strips? 4000K and I think 3500 K available with some of the offerings... They're not super efficient - under 100 lumens/watt but not by much. These are a bit more expensive, but they've got plugs at the ends for linking and they have switches. The...

Malheur is a Refuge, not a national park. My wife and I have visited. I'm sick of ranchers like the Bundys getting a free ride off the taxpayer, polluting the streams and killing all predators, then pulling this sh*t. The land isn't theirs. It's govt. land, administered by BLM and paid for...