This 100 watt Sylvania AR111 bulb has a beam spread of spot and a beam degree of 8. It's ansi code is AR111, the voltage is 12 and it has a base of push screw terminal. The push screw base can be used in the following applications, Stage & Studio Lighting, Specialty Lamps, Industrial lighting, Commercial lighting, and Tractor lighting. The 100 watt Sylvania ar111 bulb has a diameter of 4.37 inches, a filament of C-8 and a reflector lamp finish. It's maximum overall length is 2.64 inches and a rated life of 3000 hours.