HELP, What is curling my leaves; Pics included

[DevilRed]

Okay, here are a few leaves i just plucked off my plant. Ive had this reoccuring problem since last years indoor grow. Ive posted before, but finally have pics.

I guess its either over or under watering, possibly heat from my lamps.

I use a 75w HPS and a 125w HPS. I keep the plants at least 8" or more away from the lamps. I water when the soil is dry about 1-2" down from the surface. Ive tried to water more and less and can't seem to pin down what it is.

Anyone else had this happen? Its got to be a common thing im guessing if ive got it two years in a row now. The leaves curl under, looks like under water...but man im keep'n them pretty wet now.

So;
Over water?
Under water?
Can these leaves recover; or do I need to just keep an eye on new growth?

Thanks all.

[greenmonster714]

Yes, they will recover if not damaged to much. I gotta agree with the heat issue. However, I do not see any crispies or burn spots. Ambient air temps can bring up the temps in your rootzone causeing this kind of curl. A fan blowing below the canopy is not a bad idea either. Do you have a passive intake or forced? A fan blowing between the plant tops and the lamp may help a little. I'd double check your ventilation. Backing off the lamp should be automatic anytime your plants are seeing some stress. It gives them a little break from the intense light and helps them recover. Something to remember...lol. tc gm714

[DevilRed]

Well the curling begins at the top of the plants and works it way downward. Ill move them back and see if i notice progress in the right direction.