Description: 1638 MINIATURE BAYONET ... 28 Volts 28.56 Watts BA15D Base Light Bulb Cross References (Also known as) 28-028-03/DF 28-028-03DF 28-028-03DF CANIMPEX 28-028-03DF MICROLITES 1638 1638 BULB-DIRECT 1638 CHICAGO-MINIATURE 1638 GENERAL-ELECTRIC 1638 NORMAN 1638 USA 1638/28 WESTINGHOUSE 1638/28V WESTINGHOUSE