Signs of happyness as they pray to the light.
I'm not so sure. Check out this short read.
https://www.growweedeasy.com/why-are-marijuana-leaves-pointing-up
Running 600w HPS the light is a good 18-20" above the canopy...
Are they drinking at the same rate or slowing?
Certainly look locked out to me yellowing the way they are and id guess micro nute deficiency, iron or zinc or something..
But realize that thousands of people are running 600W lights about the same as you and not seeing the same issues.