thats what i dont get this light doesnt produce alot of heat and the tips and and on the leaf there are brown spots and the sides of some leafs are turning lime green and the plant is a dark color. this light does droduce a good amount of heat b.c 1 of mi plants grew 3 inches in 1 day and the second fan leafs toward the top curled down and were a lil dry. im gettin a ph tester on wed. b.c this may be the biggest problem with the plants. and i wus micical grow soil that feeds up 2 three months and i did feed the plants sum micical grow fertilizer so i may have over feed them by doin that but there still living stong.