Yeah for what it's worth, I spent about a week freaking about that my plants weren't looking good after switching to QBs. These are 480 meanwell drivers and samsung lm301b boards at 3000k, thanks to a ton of hand-holding and gracious help from
@Graytail. Suckers are BRIGHT!
So after a few years running Doc's Kit gear, when something's wrong, you know--and fast. After we got the tent up and the lights on, by day two I knew something was wrong with the plants. Being in modified 5th-run soil, I wasn't going to blame the lights for anything immediately--there were signs of this and that everywhere on the plants. Feeling a bit lost (been a while!), I approached Gray with my plan. He coached me through it--and it ended up working out! Thanks again, Gray.
Here's the story:
Initially diagnosing some MG def and N lockout, and potential signs of light burn, I first tried adding Mg (epsom salts at 4tbsp/5gal) and tuning the lights down to 75% strength--yep, it helped. But things were still nowhere near OK, so we went back to the drawing board.
I then tried raising RH in the tent to 70--that also helped. Better leaf posture, but not good leaf posture, and the dullness of the N lockout still present, with the ridges on the outsides of the leaves
still tacoing a bit. So I Super-Drenched them--Yep, again, this helped...but we STILL weren't happy with the way the A5's looked. Hell, I scared to take a brix reading!
I kept thinking, "They're not respitating properly...they should be praying", so I raised the temps in the tent to 82-84 or so...yep, more positive plant feedback--it helped, but they still weren't praying! THEN on a bit of a whim I added my old blurple leds--MASSIVE difference, in less than 24 hours!
Immediate response, plants praying, greening up and getting shinier by the day. Now very happy with what's going in there., brix was 14 last night on Neiko's A5 Killer cut.
Running 4 of these QBs in a 10x10, with two blurple leds (an old Mars Hydro and a Vispar Spectra) in the middle of the tent. Sitting at 82-84 and 55% during the day...."sexy time!"
BIG thanks to
@Graytail for all the help in getting these lights figured out. Seeing some really spectacular growth on the Runtz clones I have in the tent that have only known life under the qb/blurple combo. It's something to see! Hope this little story helps someone. Cheers!
--Stoney