Newgod-- as close as you can get it without burning the plant if your 500w setup is HPS or MH use a fan cause they cause lots of heat. you want to have a 70-80F temp.
BukDatAss Reviewed by BukDatAss on . Just one light. I've got a desk lamp with a 20w CFL, some dirt, and some seeds. Will they even try to grow with just one CFL, or do I really need to invest so much money into lighting before I know if my seeds are dead? Rating: 5