bulb specifications: GE F - 5000volt: 28amp: 0.143watt: 4base: BAY15d - Double Contact Index Bayonetglass: RP12filament: FLUORESCEm.o.l.: 2.56 inch (65.1MM)notes: aviation lampglass color is: blacklight whiteglass color is: ultra-violetfluorescentinstrument lamp.Loc. BA - 8