FC-939 XENON REPLACEMENT BULB FOR FC-933

FC-939 REPLACEMENT BULB FOR FC-470, FC-471, FC-472, FC-473, FC-475, FC-475D-10, FC-476, FC-477, FC-478. THE XENON BULB IS A LONGER LIFE BULB THAN THE FC-933 BULB SHIPPED IN THESE FIXTURES FROM THE FACTORY. THIS IS A 20 WATT BULB WITH A GY8 OR 8MM BASE SIZE.