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No, he means AC LED's. Iirc, they have a rectifying circuit which keeps current over the LED flowing in one direction. However, because half of the AC current is going backwards it closes the gate and the LED turns off briefly. For this reason AC LED's will strobe at half the frequency of the AC...

Thanks for the input. How big is that tent? Looks like a nice, clean setup. I actually saw a pretty ingenious DIY thread here at RIU on mounting a wall mount-able oscillating fan inside a grow tent. I thought about doing it, and it would probably be pretty cheap aside from the actual fan, but...

I'm currently using a tower fan in my 2'x2' tent, but it's just taking up way too much floor space and doesn't push as much air as I'd like. I thought about getting a 6" clip fan, but I'd have to make something custom for it to clip onto or hang from my tent, and the fan would be absorbing light...

Those are 3 day old clones?! :shock: They look huge.

That's how I've been cloning my girls, too. I usually leave them in a shot glass to soak for a few days, then plant in dirt. They are very susceptible to dry soil for about a week and can die in a day if you aren't careful. It seems to be a fine line between too damp (Green algae growth on...

Warm White 2600K-3700K Q4 100 Flux (lm) @ 85 °C Q5 107 Flux (lm) @ 85 °C The SPD graph in the PDF? It's just an average, there are different bins. I'd like to know if Cree even distinguish a bin for their line of bulbs, or if they just use whatever. I'd be interested to see the actual SPD...

I'd kinda like to see the spectral analysis on those Cree bulbs. Just out of curiosity, really, the results speak for themselves.

I assume you used a 240W Blackstar, or a Blackstar clone?

Veg tent: In the sour cream container is Misty, my Chiesel mom. Around her are three of her clones ready to be bumped into flower asap. In the bottom left corner there are two more clones that have recently rooted and will begin growth once they have direct vision of the LED's. I have one more...

All HPS is HID, but not all HID is HPS. Metal Halide is also considered HID, as is Mercury Vapor, etc. I think you might find better results with T5's, a 250W HPS system, or something else along those lines. If I may suggest, I'd take a look at Philips MasterColor CDM bulbs. Their CMH bulbs...

Yeah you need a ballast. Are those as efficient as HPS/MH?

RIU is messed up right now, I don't see pictures either.

Remote phosphor floor?! Now we're just getting crazy. :p It'd be next to impossible to control the beam angle, half the light would be wasted on illuminating your pots/hydro system. And I believe Green light is most efficiently absorbed on the undersides of leaves. I'm not sure if it would be...

Oh, I thought we were trying to compete with 2000W of HPS. I just figured ~40W/ft^2 of LED would get the job done, hence the numbers. I heard Illumitex actually penetrates the canopy rather well. I guess just add Watt's as you see fit? Not entirely sure side lighting is necessary. You could also...

I'd line my ceiling with 1200-1300W of Illumitex X5 spectrum (assuming the ceiling is the correct height to keep 100% of the beam angle directly over the canopy; i.e. no wall reflection). Because that would cost me ~$30,000, I'd probably opt for F3 spectrum and just buy the the LED arrays off...

Yeah, but the CRI of HPS is like 17, lol. That's not a very "true" 2200-2700k. The Grey line is a 2700k blackbody. I have never seen an SPD graph of an HPS bulb that resembles that Grey line in even the slightest possible way. Yes, HPS covers the entire visible/PAR range. You could call it a...

No idea on quality of components used in the 240W Dirt Genius. It will be a gamble, imo. It might be good to know what their warranty is like and if they'll cover shipping charges if something does go wrong.

Yes, COB's/multichips do put light out in very wide angles. They are in dire need for better optical packaging, and this looks promising. Tbh, I wonder if the Chip-Lock array holders are all that's needed. It looks like that alone would reduce the beam angle to ~120 degrees, or so. And they...

Veg is easy to do with LED. You could make something for cheaper and still get comparable results, but I'd say almost any LED grow light that you buy, so long as it covers your grow space properly, will perform well in veg...

everyone: I was under the impression that while LED's, at this point in time, are slightly more efficient than a good HPS system, but the cost savings on electricity wouldn't be hugely notable. The biggest difference is the ballast vs driver component. If you're using a magnetic ballast there is...