High-quality white light with superior lumen performanceHalogen Double Ended lamps provide bright,white light for work lights and security lighting. Rugged construction for busy work sites. Offered in several lengths to meet most application needs.High lumen output provides light where you need it. Double Ended Linear 100W 120V T3 CL 1BC. Base R7s - Base Information 10 - Bulb T4 [Diameter: .433 inch /11mm] - Lamp Current: 0.83 A - Dimmable: Yes - Color Rendering Index: 100 Ra8 - Luminous Efficacy Lamp: 17.5 Lm/W