depends man,if it's just for clones, a t5 fixture with full spectrum bulbs would be great,t8 will work to......fixtures down here at the grow supply run about 40 Bucks, but they have all metal 2bulb 4 footers at home depot for like 20dollars,bulbs the same....but there's several different types including those that use mogul sockets,I hang two of those vertically, along with a couple 1000 waters,but that's my preference,they are 175 Watts apiece,not sure of the lumen output though eBay works to,just do your reaserch on the brand/product
I want people to share what they pay. Just bulbs. Fixture price optional. How much a piece for 4ft 175w bulbs?