Sylvania "Thrift-Mate" impedance modifier for TM50 lamp

Sylvania "Thrift-Mate" impedance modifier for TM50 lamp

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Usage conditions apply
Description (Brief)
This unit (with its original fluorescent tube attached) was intended to replace one lamp in a two-lamp fluorescent fixture. By modifying the impedance of the circuit, a 50% reduction in light output could be obtained with an almost equal power saving. Sylvania marketed this 50% reduction unit and a 33% unit as stop-gap measures in response to the electricity price spikes during Energy Crisis. Characteristics: Medium bi-pin base with fiber insulator. Coil-core transformer to provide current for electrode warming, a 2 microfarad capacitor, and a bi-metal switch are housed in a two-piece, clam-shell style plastic housing. Lamp given to donor by co-inventor William Roche in 1996. (Interview on file). See also, US patent 4,163,176 to Cohen, Paget, Roche, Sadoski, and Bessone; and “Impedance Modified Fluorescent Lamp” by Cohen and Sadoski in Journal of the Illuminating Engineering Society, April 1979, page 179.
Currently not on view
Object Name
lamp component
Date made
date made
ca 1979
ca. 1979
Sylvania Electric Products Inc.
overall: 5 in x 1 5/8 in; 12.7 cm x 4.1275 cm
ID Number
accession number
catalog number
Credit Line
from Harold D. Wallace, Jr.
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Work and Industry: Electricity
Data Source
National Museum of American History
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