Fluorescent lamp ballast operable from two different power suppl

Electric lamp and discharge devices: systems – Automatic substitution of the power supply

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Details

315226, 315DIG4, 315209R, H05B 3700

Patent

active

050991760

ABSTRACT:
A fluorescent lamp control system operable from either an AC power supply of a first frequency or a power supply of a second frequency and which operates the lamp in a dimmed condition when the power supply is that of the second frequency.

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patent: 4866350 (1989-09-01), Counts
patent: 4952849 (1990-08-01), Fellows
patent: 5003230 (1991-03-01), Wong

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