If you are planning a DIY project for the construction of a Metal Halide Canopy for your Saltwater Reef, you should check out this Dutch Auction for 1-3 175W MH Lighting Kits:
http://cgi.ebay.com/ws/eBayISAPI.dll...tem=2312104222
Each Auction includes a NEW 175W ADVANCE M57 ballast, a 175W 5500K MH Bulb, a mogul base, metal bracket and power cord.