Up for Bid are 2 Metal Halide Ballast made by Advance Transformer Co. These Ballast were used for a couple of months with 175Watt Metal Halide Bulbs as lighting for a Saltwater Aquarium. I spent over $150 on these very powerful units. They are in good working condition and onlyhave a little of surface rust as seen on one of the pictures. These ballast could be used to power150 or 175W bulbs for lights thatcould be used for growing plants indoors, for lighting an Aquarium or any other project were extremely bright lights are needed. The bulbs and fixtures that were used in my set up are not included but are up for bid separately.