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This Westinghouse FSS 4528 bulb with ANSI code FSS uses 20 watts and 12 volts. It has a BA15D base, and an average rated life of 2000 hours. It has a MR11 lamp shape, and is a halogen bulb.
FSS bulb. Cross reference: JDR/M12V-20W/BA/NSP, Ushio 1000607.