Color control of a discharge lamp during dimming

Details Color control of a discharge lamp during dimming Color control of a discharge lamp during dimming

2011-04-19

2011-04-19

Choi, Jacob Y (Department: 2821)

Electric lamp and discharge devices: systems

Current and/or voltage regulation

Automatic regulation

C315S246000

Reexamination Certificate

active

07928669

ABSTRACT:
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.

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