I have seedlings (about 2" tall) and just bought a 4' x 4 t5 light. Everything I read said to get the light about 2" from the plant. Well, I did that and the tips of the leaves started browning and curling so I've backed it up to about 8" now. Do I just monitor the temperature and distance the light based on that? Or am I going to end up with "leggy" plants doing that? It seems to have stunted the growth now. Any help is appreciated!