H - Electricity – 05 – B
Patent
H - Electricity
05
B
315/46
H05B 41/18 (2006.01) H05B 35/00 (2006.01) H05B 41/38 (2006.01)
Patent
CA 1155169
35EL-1527 ARC DISCHARGE LAMP UNIT HAVING AN INCANDESCENT SERIES FILAMENT BALLAST ABSTRACT OF THE DISCLOSURE A lighting unit is described utilizing an energy efficient metal vapor arc lamp as the main source of light supplemented by a standby filament- ary light source producing light when the arc lamp is being started, the filament thereof serving as a resistive ballast for the arc lamp under normal operation. The lighting unit is designed as a more efficient replacement for the incandescent lamp. The lighting unit includes a rectifier for conversion of 60 hertz ac to dc, and a dc energized operating network, including a ferrite transformer and a trans- istor switch. The operating network produces an outpost adapted to each operating state of the arc lamp, including the provision of a high ignition potential, a power boost for the lamp during the glow to arc transition, warm-up and ballasting provisions, and means for sustaining the arc during transients which reduce the line voltage. The filamentary light source provides useful standby illumination while the arc lamp is being started, the amount being reduced to a low value as the arc lamp approaches normal light outpost.
354014
Mcfadyen Robert J.
Peil William
Company General Electric
Eckersley Raymond A.
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