The 55 is a G-4 1/2 single contact bayonet base incandescent lamp designed for general lighting and indicator applications. It is rated at 7.0 volts with a current draw of 0.410 A (±10%) and features a C-2R filament type that produces 2.00 MSCP (±25%) and 25.14 lumens (±25%) of light output. The lamp has an average life of 500 hours and is constructed with a solder-type bayonet base connection. With its compact G-4 1/2 form factor and standardized electrical characteristics, the 55 is commonly used in automotive, marine, and industrial lighting systems where reliable, long-life illumination is required.