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A $500 budget will cover a 3x3 and the LEDs to light it. As GBAUTO said, you don't need more than 150w to maximize yield in a 2x2. And since you already have the HLG100, you're already set up for a solid veg space.

Nice, clean setup. What are the dimensions of each chamber?

I've said it before, but it's worth saying again - it's just simple physics. LED is more efficient, and therefore puts out more photons per watt of input power. That leaves us with only the spectrum question. Some HID-faithfuls insist that HPS (or CMH) has a "better" spectrum for growing, but I...

Well said, my friend.

Is that HSO's Black Dog? Fucking love that strain, man. Probably my favorite right now.

Preach.

Damn. We'll miss him. He was truly a good dude.

@welight Any update on this?

Do it up! (Just start a grow log if you do.)

With HPS or blurple, yes, but unless you're running co2, I can't imagine pounding a 4x4 with 1000 watts of LM561C. There's a reason most people here recommend 30-40 watts per sq/ft (and fewer use 40 than use 30). And honestly, it seems like a waste of a driver that could be used for another...

480 watts is absolutely overkill for a 2x4. Most people settle around 30-40 watts per square foot. Very rarely do I see someone exceed 40w - that's a hell of a lot of light, and you can definitely overdo it. Make sure you get something dimmable that will provide at least 30w sq/ft, and leave...

What are the dimensions of the case, and what's your budget?

No offense, but why use three drivers turned down rather than two turned up? If I'm not mistaken (and I'm no expert, so I could be), those drivers don't achieve a noteworthy gain in efficiency when run low. Are you doing it to keep them cooler, extending their useful lifespan?

Because even if we disregard the fact that Meanwells put out more juice than rated, you'll be at almost 50w per square foot. That's mighty high for LED.

Average PPFD is average PPFD, whether it's achieved by a single point-source or many. The benefit of many points of light is that running the fixture closer to the canopy will put you at your target average PPFD at lower power, and will provide greater uniformity.

This video actually supports the argument for more sources of light, not fewer. Achieving a given PPFD via many lower-powered diodes does not mean you're giving the plant less "intensity" than that same PPFD from fewer high-powered diodes. It just means you're able to give the plant an...

Well I honestly don't think you need that 320H in the mix, but best of luck!

Lokigro is running some ChilLED lights in his grow - you can check it out on youtube. But I do wonder when we'll finally see someone on RiU using them. And I wonder how well they're selling...

What in the world are you going to do with that much power? I can't conceive of a space that would be appropriately sized to a fixture of those dimensions, running that much juice!

And what was the average PPFD in each case?