Halogen 120 volt 300 watt Photo Optic 64514 Cap Pins 6.3 mm centres Length 50 mm total Diameter 17.5 mm. This bulb is shown centre in the picture key. Osram 64514 bulb is a 300 watt 120 volt with a base of GX6.35 2-pin. This bulb's shape is a T6 and is most common for Projectors. Stage & Studio. The rated life is 75 hours and the color temperature is 3400k. The dimensions of this bulb are diameter 0.728 inches, and the light center length is 1.053 inches. The overall