Retrofit fluorescent lamp energy management/dimming system

Details Retrofit fluorescent lamp energy management/dimming system Retrofit fluorescent lamp energy management/dimming system

1984-08-30

1986-08-05

Dixon, Harold

Electric lamp and discharge devices: systems

Plural power supplies

Diverse-type current supplies

315170, 315175, 315194, 315308, 315DIG4, 315DIG7, H05B 3700

Patent

active

046045520

ABSTRACT:
In a retrofit dimming installation for a fluorescent lighting system with a conventional ballast, filament power is maintained, even when the lamps are dimmed, by providing a high frequency component to the ballast voltage. The selected high frequency component allows heating of the filaments without adding to the light output of the lamps, thereby practically eliminating the shortened lamp life usually resulting from operating the lamp in a dimmed condition.

REFERENCES:
patent: 3969652 (1976-07-01), Herzog
patent: 3999100 (1976-12-01), Dendy et al.
patent: 4277728 (1981-07-01), Stevens
patent: 4350935 (1982-09-01), Spira et al.
patent: 4371812 (1983-02-01), Widmayer
patent: 4392086 (1983-07-01), Ide et al.
patent: 4482844 (1984-11-01), Schweer et al.

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