Go to amazon and get look up 250 watt cfl.. I bought that and my plants are doing great its like 70 bucks Sent from my XT1058 using Grasscity Forum mobile app
What I would really also recommend is getting a few smaller bulbs and placing them on the side, or under the plant to get full complete coverage. A 4 pack of 23 watt CFL's for $5 at Walmart would work great.
For a single auto I'd consider an LED like this http://www.ebay.com/itm/180W-LED-Grow-Light-Hydroponic-Veg-Growth-Flower-Spectrum-3W-LED-Panel-Lamp/251658244915?_trksid=p2047675.c100005.m1851&_trkparms=aid%3D222007%26algo%3DSIC.MBE%26ao%3D1%26asc%3D25410%26meid%3D50d4f9f3d33d455ebb2773c0e4732a16%26pid%3D100005%26prg%3D10672%26rk%3D1%26rkt%3D6%26sd%3D151318275104&rt=nc And please get an extractor fan for the grow space...