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This Osram 6421 24V3W TP 10 6421 bulb with ANSI code 6421 uses 3 watts and 24 volts. It has a SV8.5-8 base, and an average rated life of 1000 hours. It has a T3-1/4 lamp shape, and is an incandescent bulb.
O-6421 BULB.
