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Vero 29 4000k is great. Should be good for flowering too

Keep us updated with the autos, interested in how much they yeld. Though iirc lowryders aren't high yielding strains even for autoflowers.

DIY is cheaper. Northern growlights and tastyled also make good COB panels. Pacific uses Crees. I find Nextlight Mega to be overpriced. CO2 is possible. The current generation of Citizen (CLU) COBs and Vero gen 7 are more efficient than the CXB cobs from Cree. 2 Photon 180CLU 1825 from...

Yes. Though not completely linear because your LEDs become more efficient when they're driven lower. So if 400W is 1200 PPFD, then you'd expect 200W to be 600 PPFD, but in practice it will be a little higher than that.

You can easily dim it to 800 ppfd and yield will be only a little smaller. At 600 ppfd yield will be only be 20% smaller or so, give or take. Wouldn't go below 500. But you can easily dim it if electricity price is a concern.

It depends if you're limited by space, or power usage A commercial grower would probably want to maximize earnings per square meter while somebody who grows for himself and sometimes to share a bit with friends doesn't need a gigantic amount of yield. If you're growing for yourself, even a...

Diminishing returns already start at about 600 but only become major around 800/900. But anything between 600-900 is fine. Going than higher than 900 means you will use a lot of energy for only slightly higher yields. 500 should work too.

Asbestos stopped being a concern in the 90s for new vermiculite. Nowadays the mines are being tested for it so it's safe.

Problem with Datura is not just that the effective dose is so close to a lethal dose. The real problem is that every plant has a different potency, and it can wildly vary. So you can at most do 1 seed at a time to gradually test the potency, otherwise you may get issues because last time for...

These are the ones tested. 15W LED grow light 500lm 630nmRed 3x + 2x 450nmBlue LED 5W 470lm 2900K LED 20W 6000-65000k Corn light bulb 69 leds 11W energy saving bulb 531lm 2700k LED 15W 6000-65000k Corn light bulb 48 leds 9W LED Light bulb 6500k No make or anything, just a few lines. How can...

If you want to use bulbs. Get some GE Brightstiks. http://www.ebay.com/itm/GE-Bright-Stik-LED-Light-Bulb-60W-Soft-white-6-Pack-General-Purpose-/232101020577?hash=item360a4c83a1:g:pjcAAOSwXeJYCrOi 2 packs (6 per pack), 12 of these is good for your growspace. Remove the plastic top, it diffuses...

Between 600-900 is fine. Above that it takes a lot of extra power for very small improvements. Below that you'd need a lot more space for the same amount of weed. For personal use and if you consume less marijuana than you can grow, 500 PPFD is fine too.

It's called a deliriant for a reason. Better try Fly Agaric for something more mild and potentially less dangerous. You can also try DPH if you really want a deliriant to see if you like it.

Yes, but you do have to steam for longer. 2 hours to be safe.

The only thing that's different between Cree, Vero, Nichia, Citizen, Samsung is the efficiency and price. Spectrum at similar colour temps and CRI is going to be pretty much the same, or very close to the same. Citizen at the moment is putting out cheaper and more efficient COBs than Cree.

Much less needed when the heat sources are very spread out and not as intense.

So the reflow soldering hassle has finally been fixed with those boards. Mid power wins now.

Reflow soldering is probably what will prevent cobs from ever taking over greenhouse lights. For mass production, reflow soldering is simpler than screwing on cobs + heatpaste

It wasn't an autoflower. And 2 plants with the same light doesn't double the harvest.

I guess that's done with reflow soldering. The thing that will probably always put SMDs above COBs when it comes to mass production.