I have fish eye cans on a dimmer switch. Usually eight cans per switch, which is what worked for me as YMMV. I put them in a cluster, in other words there is four cans on one section and four cans on the other side of the same aisle. That way if I'm working or a game just say I don't have to have the entire row of pins lit up at the other end of the basement that I'm not working on. Make sense? Cans were spaced two games apart and kept to where they were not directly overhead but shined more towards the space in between the lower cabinets so to help eliminate glare on the glass. There incandescent bulbs at 65 watts each. With all the games on and the neons, clocks etc turned on the need for overhead lighting is really not necessary but it's essential when working on them or just taking people on a quick tour of the basement...
John