LED questions

[alagrini]

I have 2 P900s in my flower room and 1 P900 in the veg room with a 400w MH also in the veg room. Problem is that when I started to flower under the 2 P900s my girls started to look bad all around color, leaves curling, and they seem to not be growing much. I have been swapping the plants back and forth between the different lights in veg. Everything is great under the 400w but it all goes bad under the P900. Same with the flower room, I had these girls vegging under that same 400w and it was great but soon as I clicked on the flower mode within days you could tell they werent doing great. The P900s in veg hang 28" above the plants and in the flower room 2 P900s hanging 24" above plants. All I have seen in a few different threads was how amazing these lights are and how soon as the plants go under the lights they perk up and start doing better than ever. I seem to be having the opposite happening. Any ideas? Are my lights to close, to far away? Do I need to change/add some nutes for these LEDs? If so what and how much. Seems like maybe there lacking something. Please help. Thanks.

 

[Kalimaki420]

Get them higher until they adapt that light, seems your strain reacts quite heavy.

What most LED grows need is some more Cal-Mag and some say less nutes @ 3/4 strength.

Most Platinum grows @ are High Brix soil they don't need Cal-Mag or try to avoid strains that need it as Mag works against High Brix as I understand it.

I got an P450 and have no issues at all, veg for 4 weeks @ 10" now I am @ 16" in flower for better coverage.

P.s and welcome to 420.

Would also help to know more about your grow.
Soil ? x gal, strain etc. ?

 

[TattooedJT]

pictures would help a lot