Is this light stress or potassium deficiency?

[bluedabadee]

Hello everyone,

My OG Kush has been under light stress for a while and symtomps like tobacco mosaic virus started but other plants not affected in tent so I think this is because of light stress.

I switched to a bigger tent and recently added 240w led to 400w hps. I don't know if related to led but the leaves with problems started to turn brown. Light distance both to led and hps is 30-40 cm now. High humidity and heat too but circulation is not bad. First photo is week 2 into flowering. 4 weeks into flowering now and the leaves I marked are now turning brown as seen on the 2nd photo. It seems only the leaves which had problems before are turning brown now.

They are growing in coco peat, perlit, worm castings and guano. I'm feeding liquid and solid form of castings and bat guano from time to time. I recently used big bud but only once. I also feed molasses, epsom salt and super vit regularly. Does this look like light stress or potassium deficiency? Maybe PH problem.. Should I flush or stick to the don't flush organic because of no salt build up? I know it's not entirely organic and this is my first grow so I'm asking for your help please. My 3 other girls are doing fine. Thank you.

 

[SmoknKush420]

Could be a mutation. I have a cinderella xx that ive taken about 50 clones from and grown in different places in different nutes and every one of them has this half coloured curled leaf thing going on

 

[bluedabadee]

Could be a mutation. I have a cinderella xx that ive taken about 50 clones from and grown in different places in different nutes and every one of them has this half coloured curled leaf thing going on

Thanks! Did they turn brown like mine? Also, how do you think this would affect the grow/yield? It's recently turned brown so I ph'd her water, keeping the lights 40-50cm, will stop feeding her a bit, check for pests tomorrow.