i added 2 of these and 4 100 watt 2700k cfls to my existing 350 watts of hps (150 watt) each to cover a 20 sq foot room i made. u think its enuff light? lol/ the cfls are hung low to light the undercaririage and the hps from above.i think its giving me 67 watts a sq foot deffinately overkill lol...