well any really, there are so many lights on the market
i use lights from home depot,ralphs,kroger......

it depends on how many lights you need. for instance. 2 200w cfl bulbs could pump out 6000 lumen each but they get hot & they dont fan out over the canopy evenly, you would need 4 200w cfl bulbs to get a good spread of light, and at that point it would be more effecient to get a HPS light setup/

so many smaller lights spread about 6-10 inches apart ive found to get a nice even spread
i use 4 to 8 to 10 lights 23/26w each 1600-1750 lumen each, 1600lumen are homedepot 1750lumen are from kroger

here are some images of my light setup

built with these items.

Hampton Bay Brushed Nickel 4-Light Bath Bar-HB2051-35 at The Home Depot

Leviton 660-Watt Keyless Twin-Socket Lamp Holder Adapter-R52-00128-00W at The Home Depot

sheet metal for reflector, comes in a roll
MD Building Products 3 ft. x 3 ft. Aluminum Sheet-57000 at The Home Depot

for vegging
23-Watt (100W) Daylight CFL Light Bulb (4-Pack)

for flower
Feit Electric 23-Watt (100W) Twist CFL Light Bulb (12-Pack)

or you can mix both for a multi spectrum when flowering.
kroger or ralphs have 1750 lumen 4pk 2600k (for flowering)

Attachment 293329Attachment 293330

hope this helps.

-growdemon