better off w/a MH, but if it is an $ issue then an hps will help out in a pinch. best light overall is MH, HPS coming a distant second followed by floro's. watts are watts, but penetration of those watts equal more/better buds. a 40w shop light bulb needs to touch the plant to be effective, same with cfl's. 1000w MH will penetrate 3ft into the "brush", once you flower with 1000w you will never go with anything less, believe me. r