I started these plants from seeds in a rapit rooter thingy and then put them in red cups with light warrior soil. Then last tuesday I put them into 5 gallon pots with ocean forest and I mixed in some perlight and peat moss because I didnt have enough fox farm. I put them into the 600 wt hps at 26 inches. I dont have a mh so this will have to do for this grow until next time. It looked like I burnt the leaves with heat so I moved the light to 40 inches. They have been in there for one week now and the light is at 36 inches with the tent at 79-80 at the highest and 74 at the lowest with the lights off. I have been feeding them just tap water that I put into one gallon jugs for atleast 1 day before useing the water. The leaves are still doing this so I dont know if its the soil is too strong or the light is too powerfull. They did have 30wt cfl's for the first month. One plant which is called surup is taking off with great results. All the SLH are pissed off. Here are some pics. Can anyone help me understand whats up with these girls?
You say you have the temperature at 79-80, and at 74 with the light off. The temps sound fine, at least during the veg stage. My first question is, why are you turning your light off at all? Your light should be on 24/0 or at least 18/6 for the first 3-4 weeks (veg period) of the plants life. Then you switch over to 12/12.
Judging by your pictures, it may be heat stress but could also be some sort of root lockout or maybe even underwatering (the soil in your pots look a little dry). You can never let a pot get so dry that it is sandy like that. The worst combination a plant can have is heat stress and underwatering, that's the fastest way they'll die. I've seen veggies like that before, it wasn't too hot in the room but the problem was my air circulation.
What kind of nutrients are you giving the plants, and at what ppm, or is it just water? Make sure your pH is always at 6.5
Last thing, if you don't already, get a fan in there and have it blowing sideways in between the light and the plants, shooting all that heat out to the side.