Just started flowering - curled twisted leaves

Hey everyone I just switched my lights from HPS 18/6 to MH 12/12. Everything was going fine for a few days and now all of a sudden ive noticed the leaves are starting to cup up, some of the tips are twisting and the edges are curling up. The humidity is 25-35%. The MH is about 18"-21" away from the plants and I have a pretty good fan blowing between the light and the plants. I have a humidifier as well but I'm having trouble getting the humidity above 40%. I fed one plant out of the 3 I have because the leaves were turning pale green. The leaves came back to normal color but now all 3 have curling and twisting leaves. Let me know what u guys think. I would hate to lose these now. Thanks again

Btw did you mean switched from MH to HPS because flowing under an MH isn't going to work as that's your vege bulb.

If you have switched to MH then there's your problem. Switch back to HPS under 12/12.
If you are using HPS then raise the lights 6 inches and see if they improve. HPS seems to shock them a bit and they don't like them as close as the MH.

Your lights are backwards IMO. Use your HPS for flowering, it mimics the late summer light better.

Pfft, use 'em both for flowering!

BenFranklin said:

Pfft, use 'em both for flowering!

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Yeah if you have the resources this is best! I usually use 2x hps with cool tubes, and then add 3 6500k CFL lights on each side of each cool tube. I love how that setup flowers.

I was running 400w hps and mh... Cut to the chase and went down and recently got a 1000w digital Phantom, w/ a hortilux and GH's xtrasun.

it was in middle of the cycle, so stretch was pretty good.. Next cycle will be niiiiice.

since the cold snap... They're starting to turn those rainbow colors.. But the hairs are still silky white not even close to turning yet, the trichs are coming out significantly.

i love smoking rainbow weed.. Lol....

I had a similar problem I truly dont believe your light will fix problem completely but flush your medium w good clean water and then reapply nutes. I flushed w 6.8ph water let the soil dry out and then applied nutes and plants came back 100%. I ran 15 gals thru each 5 gal bucket

I can't believe I screwed the lights up. I've used the the HPS for the whole grow pretty much. They look healthy nice full and bushy. They don't look like they are messed up at all I switched to 12/12 with the MH for like a week. I just saw ur post and switched it back to HPS. Do u think I should be worried? Did I screw them up big time? Let me know what u think. Thanks again I appreciate it.

I can't believe I screwed the lights up. I've used the the HPS for the whole grow pretty much. They look healthy nice full and bushy. They don't look like they are messed up at all I switched to 12/12 with the MH for like a week. I just saw ur post and switched it back to HPS. Do u think I should be worried? Did I screw them up big time? Let me know what u think. Thanks again I appreciate it.