Discharge lamp operating circuit

Details Discharge lamp operating circuit Discharge lamp operating circuit

H - Electricity

05

B

315/53

H05B 41/30 (2006.01) H05B 41/231 (2006.01)

Patent

CA 1091289

ABSTRACT OF THE DISCLOSURE Color rendition of high pressure sodium vapor discharge lamps is improved by disclosed operating circuit for applying pulsed direct current to the lamp. The circuit includes a direct current ballast circuit having a low ripple factor, a filter capacitor charged by the output of the ballast circuit, and a pulsing circuit comprising a transistor switch which operates to apply DC pulses on the lamp at a predetermined repetition rate and duty cycle to provide desired color properties of the lamp.

281670

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