if you do a little but of reasearch youll find tons of information on this too, im not gunna spill ALLLL the beans
drudown11 Reviewed by drudown11 on . UVB or MH at the end of flowering Does anybody know if supplementing HPS with MH or UVB lamps in the last couple weeks of flowering increases potency siginificantly? perhaps during final flush? I've also heard of people using UVB for like 4hrs a day while running hps on the normal 12. Rating: 5