it looks like you got some water or nutes on there and the lights burned them.

your temps are getting pretty high. are they in a box or tent and if so what size? are your intake and exhaust fan the same CFM?

and your res temp seems to be getting a little high. i'm not a 'dro guy though, so don't listen to me there. i'm sure one wil chime in.

did you soak your rockwool in pH'd water?


-shake
headshake Reviewed by headshake on . bright yellow spots OK - first off, apologies, as my digital cam isn't working...but I can describe the problem pretty well. Set up - one female flowering for about ten days in an NFT system under 250 HPS, with an EC Meter reading of 1.4 consistently in both veg and flower. Water and grow-tent temps exactly where I want them. I change the water every 3-4 days. Plant generally looking in excellent health until about three days ago, when I noted bright yellow spots in the middle of just some of the leaves...not Rating: 5