Give them more nutrients I throw clones under 750w in a 4x4 24ish inches away full strength nutes and don't have yellowing. As they get bigger I move the lights to 12-16in still don't get yellowing
Just installed 2x 260w xl kits in the 4x4 Monday. The lights work great. But The plants have not taken to them at all.......major yellowing from the top down. Leaf taco going on as well. Ive got the lights pretty much as high as I can go. 22”.....Going to get a killawatt meter tomorrow so I can dim them.
Anybody else have any issue with their plants adjusting to the QB’s ??
I growing in supersoil. You think the different light spectrum would change how much they take from the soil? I just transplanted them into bigger pots so lack of nutrients shouldn’t be an issue.
They were growing under different lighting before? If so they could take a little while to adjust. Dim down and let settle for a week, are other parameters the same from pre-quantum to now? i.e. temps, humidity etc. and if after a week you don't see improvement then I would have to agree with @Ryante55
Maybe need hotter soil? Unless your plants are crazy sensitive idk why I wouldn't get any bleaching when other people do. I run alot more watt per square foot than most so only thing I can think of is that I'm using more nutes. What lights were you running before?
Ya i burned the crap out of mine. It was like taco Tuesday in my grow room after an hour. Then I underestimated how many nutrients they would need. I'm currently giving my plants full strength Advanced Nutrients Sensi Bloom A and B and they're looking much better. step the lights up slowly. I'm running it about I'm running about 80 watts per Quantum board at 25 in.
Just installed 2x 260w xl kits in the 4x4 Monday. The lights work great. But The plants have not taken to them at all.......major yellowing from the top down. Leaf taco going on as well. Ive got the lights pretty much as high as I can go. 22”.....Going to get a killawatt meter tomorrow so I can dim them.
Anybody else have any issue with their plants adjusting to the QB’s ??
They where under 100w closet case and some t5 in my veg tent. Basically same temp and humidity. I grow on sip containers. So they just went from a 2 gallon up to a 7 gallon. Soil mixed the same as always.
My last run I had 3 100 watt closet cases in my 4x4 tent. So the Qb’s are a big jump up.
Yeah plants are most likely just starving do a foliar spray and some good compost tea keep the lights closer than 20"
All the plants are settled in and putting out lots of new green growth which is a welcomed improvement. Some of the plants had a rough transition but theyre all on track now and I have to raise the lights already. 
yo bro, you add calmag? this is a must with these lights. I find using soil/supersoil with added 1ml per 16 oz or 8ml per gallon helps tremendously.
I Foliar spray with cal-mag. But never feed with it. Sense the issue popped up I’ve topped dresses with worm casting, kelp meal and oyster shell meal. Added some Epson salt and Molasses too my water when I top feed.....also some mammoth P.
Well hopefully this dose of cal mag I just gave them shows me some sort of improvement.
I Foliar spray with cal-mag. But never feed with it. Sense the issue popped up I’ve topped dresses with worm casting, kelp meal and oyster shell meal. Added some Epson salt and Molasses too my water when I top feed.....also some mammoth P.
I just gave them some cal mag with their water at this point it doesn’t really matter.
Other then their sickening-colour they seem healthy.......I can already see roots popping out of the bottom of the air pots after 1 week....I’m just about to say fuck it and start over.
White widow in left sensi star the right
I also just dimmed the lights down a bit too. I couldn’t get a kill a watt monitor ( got one coming on Amazon) but when I turned the dimmer screw they where pretty much full blast so I turned them down about a 1/4 strength....I’m guessing.
They're 5s. I'm considering going to 10s but I worry about losing space in my tent. I have a few strains I need to get going so I want to be able to do 6-8 plants at a time in veg. I have a buddy who runs four 20 gallon pots in his 4x4 so I'm thinking I should be able to do 5-6 ten gallon pots?
