General Electric Company

Alan George Chalmers

Bernard Patrick Bewlay

Bruce Alan Knudsen

Mohamed Rahmane

James Scott Vartuli

Jianwu Li

Gary Robert Allen

James Anthony Brewer

Viktor Karoly Varga

Timothy B Gurin

Anjali Kotkunde

James C McNamara

A ballast circuit is suitable for driving a high intensity discharge lamp in at least two power modes including a nominal power mode for driving the high intensity discharge lamp at a nominal power and a reduced power dimming mode for driving the lamp at less than the nominal power. The lamp ballast circuit generates a first alternating current waveform during the nominal power mode and generates a background alternating current waveform in the reduced power mode which is perturbed at intervals by a high intensity pulse which helps to reduce the change in correlated color temperature which would otherwise occur in the dimming mode.

Color control of a discharge lamp during dimming

A lamp comprising an arc envelope and a molybdenum-rhenium end structure coupled to the arc envelope.

Ceramic lamp having molybdenum-rhenium end cap and systems and methods therewith

A method and system to supply current to a high pressure lamp is provided, the method and system comprising an alternating lamp current waveform with a half cycle mean amplitude Iand a half cycle time duration T, a current pulse waveform including at least one current pulse with a half cycle mean amplitude Iand at least one current pulse occurring after the trailing edge of a half cycle of the alternating lamp current, the pulse having a half cycle duration of Tp. These waveforms are combined to generate a current waveform including a current pulse waveform, the current pulse waveform starting after a time delay Td from the trailing edge of a half cycle of the alternating lamp current waveform, the time duration Tp of the at least one current pulse lasting less than the remaining time before the leading edge of the second half cycle of the alternating lamp current waveform. The combined current waveform supplies current to a high pressure lamp and produces a cone shaped tip protrusion which reduces lamp flicker.

High pressure lamp with lamp flicker suppression and lamp voltage control

A lamp comprising an arc envelope and a niobium end structure coupled to the arc envelope, and wherein the end structure is shielded from a dosing material disposed within the arc envelope.

Ceramic lamp having shielded niobium end cap and systems and methods therewith

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Akron, OH, United States of America

Alan George Chalmers