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1942 - J.H. Campbell conceived and developed the basic idea for the use of only one ballast


CD 1963078 E&MP 25.015

Electric Lamps

Jul 9, 1942

J. H. Campbell, Nela Park lighting engineer, has just inserted the fourth G.E. Mazda 100-watt fluorescent lamp in this fixture employing the new "sequence-starting circuit".

Campbell conceived and developed the basic idea for the system which permits the use of only one ballast -- or control unit -- instead of two ballasts. The single control unit, not visible in this angle view, is mounted on the top side of the fixture. Listed among the advantages claimed for the new system are these:

1. Permits a saving of nearly 50% on critical materials used for ballast equipment.
2. Fifty per cent reduction in ballast cost.
3. Overall reduction in fixture cost of approximately 20%.
4. An 8% increase in light output per watt of current consumed.
5. A marked reduction in weight of fixtures.

Original Caption by Science Service
General Electric

National Museum of American History


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