This Mini case 20W, 120/277V ballast with bottom feed with studs provide easy installation, even if remote mounted. It
features superior line and lamp voltage regulation due to advanced
microprocessor control and superior reliability with patented Half
Bridge technology. Since 1985, Hatch has been the recognized market
leader in the design and manufacture of premium power ballasts and
lighting products. The Hatch MC20-1-J-UNNU electronic metal halide
ballast is no exception.