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Talked to a guy who really knew his stuff, it's like you guys said it's a nitrogen deficiency, happens when you switch over to the red Kelvin light, the plant begins to think it's time to Flower even if you haven't flipped to 12/12. So It begins up taking massive amounts of nitrogen and...

Sure did, upped the ppms from 800 to 1200, cal mag at 300 ppm after fresh ro, then 900 of my dyna nutrients. My friend had the problem with other nutrients as well. I'm gonna convince him To switch to soil never had this problem.

I've tried everything, even when I moved his hps super high like 3 feet the plants still yellowed, I don't understand why hps causes yellowing leaves. And yea under the led I have moved them up and up and still getting yellowing, I think the plant just can't handle the leds. I am Going to...

also for anyone intereted, i run my friends vero 29 at 75w and with a lux meter at 16 inches away it reads 22,000 LUX, so not bad at all, and BIG UPS!! to digikey, they sent me a broken Vero 29 and without hassle or debate they shipped me a new one for replacement.

then i would say open the thing up, wouldn't hurt, then we could put all of the speculation to rest.

hello all my Vero loving friends, so i built a 8 x ~75 W mixed vero 29 (4 x 3000K(80 CRI) ,4 x 4000K(90 CRI) , pushing a whopping ~600w my friend is loving it as i built it for him, but now he has a problem, his plants are yellowing hard a F*** he had this same problem when he moved from a...

i have a Cen-100-36 and my screw DEF stops and actually pushes my LED up to 120W (which is nice but, sweet Jesus its bright overkill) but i have felt before that the screw didn't stop but my dumb self wasn't actually turning anything.

If your going to build a Vero, mine as well Use a Vero, everyone likes Cree because we have more. Grows using them and that is all how this obsession started (thx supra) but from every page I read and specs, the Vero cobs are better at running high w(75), so it's more up to how many watts...

Update?

Just read through this whoooole post. I had the same problem. When I switched my lights over from hid to. Hps, typically hps have a huge increase in lumens that the plants aren't used to, this time. Around I switched from a 1000w hps to a 360w of Vero 29 3000k and 4000k, and low and behold...

That upgradeability is just... Amazing. That was one huge selling point for me. So when new ones come out its still cheaper than what it would have cost me in hps bulbs. Plants are looking good too man! Looks Like you got a wayyys to go.

I just went the cpu heatsink method... It's meh, If I could do it again I'd go with heatsink use and swing by frys grab a nice large fan and a rhino power brick ($9) no wiring fans just plug and play.

Those my friend are knat larve they thrive on the roots. I used to open my hydro bucket and watch them fly out by the dozens. I used sm-90 and they all go bye bye. Sm-90 isn't advertised as a bug killer, but it does kill a lot of stuff that's in the water including fungus and good bacteria.

Just ask, it can't hurt.

Hmm, interesting, but not really cuz both owners could give two shits about marijuana...http://bigbudsmag.com/scotts-miracle-gro-buys-general-hydroponics-marijuana-growers/

I like those numbers... I can understand those number... We can work with those numbers. When ever I see people say gpw... We rarely know the space they used, time vegged.

Woah woah buddy, that is not true on the prices, a 300 Watt Cobb would not be $600-800??? If he went with Vero, run at 75w, that's 4 Vero, x 28= $112, 2 hlg drivers at $70 x 2 = $140, then miss heats sinks, etc, about $80, ===== $330 plus S&H $360....and that was being modest, I built an...

If this picture right here doesn't sell people that Led cobs are the future... You're either blind or smoked your brain to mush.

Dip $hit, I never said anything about a motherboard... there is a small board under the fan. THAT board was fried when the polarity was reversed. Go ahead... grab a computer fan and look at the underside... I'll wait.

No no no, I did not apply voltage to the pwm pin, I immediately cut off the other two wires for safety precaution. I reversed the current to the red and black wires chasing the small board to be instantly fried. There is no safety diode to prevent it being fried (El cheapo punks)