Southwire 7539SW 100-Foot Indoor/Outdoor Light String, 10-Lights and Metal Guards. 100-foot extension cord with 10 lamp holders and light sockets. Evenly spaced sockets every 10-feet, accepts bulbs up to 150-watts each, A23 or larger. 15A temporary lighting string with metal guard, commonly used with new construction and jobsites. Suitable for both indoor and outdoor lighting systems, Meets OSHA, NEC Requirements, UL Listed. Temporary indoor and outdoor illumination for attics, garages, unfinished construction, and more. Includes attachment plug cap and cord connector. Lampholder spacing is 10-feet, starting 9-feet from the plug. Maximum string wattage of 1875-watts. 12/3-gauge SJTW power cord is durable and withstands moisture, abrasion, chemicals and prolonged exposure to UV rays. Industry approvals: UL, NEC compliant, meets OSHA requirements. (BULBS ARE NOT INCLUDED).