150 Watt BR38 Incandescent Flood Light Bulb, 4.75" Diameter, Indoor/Outdoor (Weatherproof), Long Life (20,000 Hours) 150 Watt, 120 Volt, Made in U.S.A. Base: Medium, standard light bulb base (Brass) Average Life Hours: 10,000 Shape: BR38 (4 3/4" Diameter, 5 5/16" Length) Indoor/Outdoor Use