Manfacturer: Westinghouse Electric Corp
This is the Westinghouse Mazda 150 watt 120 volt lamp, circa 1920s. It employs the "Mazda C" technology; the "C" terms means the lamp is gas filled, versus "B" for vaccuum lamps. This lamp was manfactured at a time not long after the lighting industry dropped old tipped light bulbs in favor of lamps evacuated from the bottom stem well, a practice that continues to this day. Also employed is the early PS-25 envelope, whic is shaped like the PS-30 and larger lamps. Most PS-25 lamps, even those made in the 1920s on, have a shape much more like the regular A shape. Additonal photos including the box the lamp came with can be viewed below.
Lamp: High wattage incandescent
Wattage: 150
Voltage: 120
Bulb: PS-25
Finish: Clear
Base: E-26s Brass Medium Base
Class: C
Filament: C-9 w/ 3 supports
Lamp Life: 1000 hours
Manf. Date: 1920s (exact date not known)
Country of
Orgin: USA
