Hi Jim,
Do you have a canopy that is able to house the new bulbs an appropriate distance from the water? If so then there are many options for DIY kits. I don't like to deal with wiring so here is a list of what I purchased for my 2x250w 10k system, that I screwed into my canopy. This assumes that I understood your request for what was necessary!
Dual PFO 250w Tar ballast (Cheap but efficient)
2x 8ft quick disconnect cords for the above wired to Mogul sockets (I did not want to wire)
2x250w 10k venture bulbs
4ft long cheap reflector
2x Icecap variable speed fans.
I purchased everything except the fans on ebay and was very happy with the results. I paid $185USD for the ballast, wiring, sockets, and reflector and an additional $105USD for both bulbs combined. With exchange, shipping, taxes, etc the entire package without fans came to about $500.
I purchased the fans at J&L, and simply screwed everything into my canopy.
If you do not intend to put the bulbs into a canopy then I typed this for naught! At that point some of the prebuilt pendants are a great (Albeit expensive) way to go!
HTH,
Rob
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