Gas discharge lamps and systems

Details Gas discharge lamps and systems Gas discharge lamps and systems

H - Electricity

01

J

H01J 21/16 (2006.01) H01J 61/04 (2006.01) H01J 61/64 (2006.01) H01J 61/70 (2006.01) H01J 61/92 (2006.01) H01J 65/04 (2006.01) H05B 41/282 (2006.01) H05B 41/392 (2006.01)

Patent

CA 2185774

Conventional fluorescent discharge lamps can have a glow mode electrode extending along its length to extend its dimming range. In the present invention, there are two glow mode electrodes wound around the lamp in a helical fashion. One circuit drives the main electrodes at opposite ends of the lamp at high levels of brightness. Another circuit drives the glow mode electrodes at low levels of brightness, at about 10MHz. At intermediate levels of brightness, both the main electrodes and the glow mode electrodes are driven, the two sets of electrodes being driven for alternate on and off periods with the glow mode electrodes being on when the main electrodes are off and the glow mode electrodes being off when the main electrodes are on.

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