Eiko 503 Bulb | 0.15 Amp, 5.1 Volt, 0.77 Watts, G4.5, BA9 Base

This incandescent bulb with ANSI code 503 uses 0.15 amps, 5.1 volts, and 0.77 watts. It has a G4.5 lamp shape, and BA9 base. The 503 bulb has an average rated life of 100 hours.