Description: ETD 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 dual contact bayonet base, and an overall length of 2.4 inches. It has a Kelvin temperature of 3000 and is rated at 1000 life hours. ETD Ushio Modeling Light Bulb