This High Efficiency wall liter is made of cast aluminum with a heavy-duty mounting yoke. Opposite end lamp placement, specular reflector, parabolic louvers, and efficient electronic ballast insure the highest level of lumen output over a broad area. The CTL15142 utilizes one 42watt triple twin tube Fluorescent bulb (4-pin GX24q-4 base) operated on an electronic, energy-efficient ballast.