SEF Lamp dimming
First Claim
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1. A method of dimming an SEF lamp comprising:
- applying current pulses to said lamp at a first frequency, l/T'"'"', and repeatedly interrupting said current pulses every l/T1 seconds, said interruption lasting for a time, T1 -T0 seconds where T'"'"' is less than T1 and T0 is no greater than T1.
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Abstract
Solenoidal electric field lamps are effectively dimmed with no loss in lamp efficiency by powering the lamps with high frequency current pulses and periodically interrupting the current pulses in a time ratio fashion in order to reduce the average power being supplied to the lamp. The lamp may be dimmed from 100 to 0 percent of full power in an efficient manner as long as the pulse interruption period is less than the plasma deionization time of the lamp.
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Citations
6 Claims
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1. A method of dimming an SEF lamp comprising:
applying current pulses to said lamp at a first frequency, l/T'"'"', and repeatedly interrupting said current pulses every l/T1 seconds, said interruption lasting for a time, T1 -T0 seconds where T'"'"' is less than T1 and T0 is no greater than T1. - View Dependent Claims (2, 3)
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4. A dimmable SEF lamp apparatus comprising:
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an SEF lamp including an evacuable, light-transmissive phosphor coated envelope containing an ionizable medium which is electromagnetically coupled through a toroidal ferrite core which is coupled to a source of radio frequency current pulses operating at a first frequency, l/T'"'"'; and means for interrupting said current pulses every l/T1 seconds for a time T1 -T0 seconds where T'"'"' is less than T1 and T0 is no greater than T1. - View Dependent Claims (5, 6)
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Specification