They are 1x32w electronic ballasts, made by Sola Basic Industries. It is a quite good Mexican brand, I think they export too. These are the best for aquarium lighting around here. Although their durabilty would probably be less than the large metal ballasts (3 year vs 5 year warranty), they are still the best choice, and they cost less. They weigh about the same than a 4ft tube, and are completely silent. They come already with encaps, which can easily be isolated from moisture with some duct or electric tape. Only the two power cords to wire up. Other advantage is you can have each tube on its own switch. I am surprised these haven't made their way through the US.