Cooper Lighting. Bulbs in the Halo compact fluorescent recessed downlighting line are dimmable. The downlights are Energy Star-qualified and feature energy-efficient electronic ballasts and dimming from 15 percent to 100 percent, according to the manufacturer. Available for both the 5-inch and 6-inch aperture lines, the 5-inch housings use 26-watt bulbs and the 6-inch housings take 26-watt and 32-watt bulbs, the company says. Homeowners can choose from a variety of housing trim styles and finishes, including reflectors, baffles, wall wash, and shower trims. 770-486-4800.