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To tell you the truth, I'd probably still go with the 3500s but add a dimmer so you don't roast your babies. 5000 is supposed to be better for veg but 3500 will work for the whole grow.

They'll work but very few ate actually grow bulbs. 6000 or 6500 for veg and 2700,3000 or 3500 for flower.

If the case is almost packed with heatsinks, it can handle 9 vero 18 actively cooling. I'm thinking about putting 6 of them external, passively cooled and keeping the other 3 in the case with the drivers. This is going into an 18 x 24 space with 2 plants so an "H" configuration might be best...

After days of research and more research, I'm building a light from scratch. A 4.8 inch by 20 inch heatsink from heatsinkusa.com with 2 fans on it 2 CXB3590 1 Vero 29 HLG120-1400 This whole setup is around 230 bucks, say 250 by the time it's all done, and it should rock the house with light. I...

If it's just for flowering, I'd mix in some 3000 and 4000 but 3500 alone is fine.

3500

That's pretty much the same light as the Mars Hydro or GalaxyHydro. They're dirt cheap, reasonably effective and they're not very good. They ain't crap, you can indeed grow good weed under them, but a DIY COB is a lot better. Check out some of the DIY builds, it's intimidating at first but...

The center of the first picture, where it "branches" a clear pic of that...

I ran 2 bagseeds first and they were high quality but not very dense. About an ounce and a half each in an 18 x 24 space in organic soil. I then did 2 autos from Budha seeds and 1 failed to flower on 16/8 so that one doesn't count. The other auto yielded the same ounce and a half as the photos...

I have a GalaxyHydro 300 and it works OK, better than CFL, not nearly as well as HPS. After 2 harvests with it, I'm looking to modify it with COBs and ditch the LED panel it came with. For a hundred bucks, it got me by for a while and it has a decent case that can be salvaged for the DIY build...

I run one. It works. Better than a kick in the nuts but not great either.

What driver did you use on the Vero 29?

Can you take a close, clear picture of the internodes? Like the first pic was but even closer. You might have a male there.

I'm not against efficiency, but I'm not sure there would be a noticeable difference in efficiency. Why is everyone hating on the 72v version? Is there a chart somewhere that would show the input/output/efficiency etc. of various cobs at various currents? I thought I had seen one on here...

The heatsink is not even close to what he had. I'll be adding/replacing the heatsink. The only reason I'm looking at the 72v is so I can buy half as many, especially if it's just a marginal tradeoff in efficiency.

I have the 3 drivers, all identical. I could put 1 72v cxb3590 on 2 of them and then 1 36 volt cxb3590 with a few of the reds to fill the voltage gap. Similar to growmau5 but using 2 fewer cobs. Any suggestions for that setup?

For the additional 150 to 180 bucks for the cobs, even at 500ma each, on an active heatsink, I don't know where to find the calculations but I'd bet I'm well within the safe zone for cooling.

I believe he was trying to say you get more lumens per watt at the lower current. Couldn't I run 3 of the 72 volt CXB3570s, one for each driver and mount a better heatsink? Seems better and cheaper than doing 4 or 6 cobs.

3 of these

There are heatsinks with fans mounted over them. I am unsure what the drivers are, I'll likely have to pull it apart tomorrow and check. I've had it apart once for a good vacuum cleaning and it all went apart and back together pretty easily. I'm looking for a shopping list of parts compatible...