H - Electricity – 05 – B
Patent
H - Electricity
05
B
H05B 37/02 (2006.01) H05B 41/14 (2006.01) H05B 41/232 (2006.01)
Patent
CA 2393815
An apparatus and method are provided for operating one of a plurality of lamps employed within a luminaire via a single ballast, thereby extending the operational life of the luminaire. The operating lamp disables the lamps downstream from itself by preventing current from conducting through lamps other than the operating lamp. The lamps upstream from the operating lamp typically lack a sufficient voltage for ignition and operation. However, if any of the upstream lamps begin to operate, the lamps operating downstream cease to operate. In the event that two lamps begin to operate in an asymmetric manner, a capacitor is preferably provided to maintain a reverse voltage with respect to the output of the ballast, thus ensuring reduced voltage across the rectified lamps until one lamp extinguishes and the second lamp begins to operate.
Finlayson & Singlehurst
Hubbell Incorporated
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