anyone know what this is

I'm 6weeks into flowering, using foxfarm nutes and feeding schedule, 1000hps 12/12, noticed this like a week ago , any help would be greatly appreciated....

its hard to tell in the hps lighting but to me it looks like nute burn or its to hot on the tops of the plants

Looks a lot like heat stress, could be nute burn, but usually you have some spotting, and many times it affects the lower leaves first, moving up to the higher leaves.

get some pics in regular light if you can

I did lower the lights recently, and thats when it seem to have start. It doesnt feel hot on my hand though...Does that matter? I had a suspect that it was heat stress. How far should a 1000watter be from the tops?

i use a thermometer to put ont op of the plant to see the temp. if it doesnt burn your hand though it should not burn the plants. if you had better pics it would be easier to tell what it is. pics not with the hps on

Are you using the Tiger bloom in full strength?

Ive heard of people who use the tiger bloom in full strength, and they say they experience leaf curling and brown spots right when they started to use it.

If you are using it...maybe dilute it to 1/2 or 1/4 strength and see if that helps...and that 1000w lamp might be a bit too close...