The Osram 646420HLX, ANSI FDV bulb is a 24 volt, 150 watt clear, quartz glass T4 halogen lamp.
The operating position for the FDV is vertical (within 45°) base down.
With a lumen output of 4300 lumens and a rated life of 300 hours, the FDV is used in projection, medical and photographic applications.
Cross reference brands and part numbers: GE 36878, Philips 23978-0, Ushio 1000505.