Hi, here's another issue- anyone know what this is?

Temps? Humidity? type of light system?

400watt MH, 3 feet away. good air circulation. It does get hot in the day time- so much so that its hard to stay in room. I think you answered my question though- it was related to the hot temps in daytime and must be heat stress. Thanks!

Picture 1 shows cupping as in the leave is trying to shade itself by reducing surface area. Heat stress seems the cause. Plus the lights look liked they bleached the leaves. It could be a nute + temp + light issue.