ya i kno about the changing colors and wat not i just stay in that area for myself just to be on the safe sideoldie!!!!.... you can go down to 65 degrees! thats how i get my flowers to change colors, and u can go up to 100 degrees but u dont want it to be 100 degrees the whole 12,18,or 24 hours that the light is on! think about outside,u get days that get into the 100's but its not 100 degrees out all day!..