The lights used are 4 x 4' fluorescent tubes spaced about four inches apart, and that covers 6 regular grow trays (you can fit up to 40 of the pots used into one single grow tray) so it really is an efficient way to grow alot of plants.
It's a mixture of cool white tubes and Grolux tubes, spaced evenly apart. Cool white tubes will work ok by themselves, but the Grolux tubes emmitt a broader light spectrum which I believe when used in conjunction with cool white tubes benifits the plants.
They are run on an 18/6 schedule (18 hours on, 6 hours off) per day.
If you are unfamilar with Grolux, they are manufactured by Sylvania and are commonly used to light aquariums to promote plant growth (they emmit a purple light).
Obviously everyone's light requirements will be determined by the number of plants they wish to grow.
Cfl's would work well too. You want the lights as close as possible to the tops of the plants without touching them, an inch or two is perfect.