Description: ESN Ushio Modeling Light Bulb - This lamp is a 120 volt, 100 watt halogen light bulb. It is tubular in shape with a glass diameter of .5 inches, a screw base measuring 11 millimeters in diameter and an overall length of 2.75 inches. It has a Kelvin temperature of 3000 and is rated at 1000 life hours. ESN Ushio Modeling Light Bulb