To save a few bucks if you are handy get bulbs/ sockets made for aquariums, and get ballasts at electrical supply locally(graybar or similiar company) advance ballasts M-57, M58, and M59 are good for standard bulbs , I am sure there is a chart or thread about it somewhere. If you like the 6500K color you can run Isaki bulbs off a mercury vapor ballast, but it will look yellowish, good for frag tanks, etc.