H - Electricity – 05 – B
Patent
H - Electricity
05
B
H05B 41/36 (2006.01) H05B 41/18 (2006.01)
Patent
CA 2306294
A method and apparatus are provided to retrofit a gas discharge lamp ballast designed for use with a first lamp having a first power rating to be used with a second lamp having a second power rating. The ballast has a core, a coil and a serially-connected ballast capacitance device and is characterized by a first net impedance of the ballast reactance to allow operation of the first lamp in an operating range in which the first lamp is designed to operate. When the first lamp is replaced with a second lamp having a different lamp impedance than the first lamp, the capacitance of the ballast capacitance device is selected so as to change the first net impedance of the ballast to a second net impedance which allows the ballast to maintain proper operating of the second lamp in accordance with its specifications and rating.
Flory Isaac L. IV
Kenyon Lewis W.
Finlayson & Singlehurst
Hubbell Incorporated
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