I wish I could say they don't burn, but I do have a heat problem if we're not in the midst of Winter. The hood is enclosed and I run the six inch inline at full throttle whenever the light is on, so I can get pretty close but the secret is out now. RM has ugly plants with burn, thanks Defect. Seriously, I get burn and ugliness, some from heat, some of it from high ppm, and some from mismanagement and laziness. I hide/ignore that when I'm trying to show off for yall.
The way to ramp up terpene production is to take the plants to the edge. Burned leaves make delicious oil.