so if i turn on 4 t5 24 watt lights on it about 2 inches away i can use that until i change the light cycle to 12/12 rightGordo is wrong. Place about 1-2 inches away and (if you need it) aim a small fan at it to help it cool. I would turn on the MH when they're about 5-6 inches. You could use the MH at like 3 inches but its all up to you. Since you have the t5 you could use that through veg