Patent ID: 6181085
Filing Date: 2001-01-30
Classification: H05B,Y02B,Y10S

Abstract:
An arrangement comprising:a source operative to provide: (i) an AC power line voltage between a pair of power line terminals; and (ii) a control voltage between a control output terminal and one of the power line terminals; the source including a control means operative to effectuate adjustment of the control voltage; andan electronic ballast having: (i) two power input terminals connected with the power line terminals and one control input terminal connected with the control output terminal; (ii) a set of ballast output terminals connected, via a tuned LC circuit, with a gas discharge lamp and operable to supply an alternating lamp current thereto, the frequency of the alternating lamp current being many times higher than that of the AC power line voltage and remaining substantially constant during a complete period of the AC power line voltage; and (iii) control circuitry responsive to the control voltage and functional to control the magnitude of the lamp current supplied to the gas discharge lamp and thereby the amount of light generated thereby.