Multiple intensity lamp controller and lighting system
First Claim
1. A multiple intensity lamp controller adapted to be coupled to a multiple filament lamp having at least a primary filament and a secondary filament coupled in series with each of other and to a power source, comprising a variable impedance coupled across said secondary filament wherein the intensity of said multiple filament lamp is comparatively bright when the valve of said variable impedance is comparatively low and wherein the intensity of said multiple filament lamp is comparatively dim when the value of said variable impedance is comparatively high;
- whereby any range of failure in the value of said variable impedance will result in said multiple filament lamp still being lit.
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Abstract
A multiple intensity lamp controller and lighting system utilizing a multiple filament lamp having a primary filament and a secondary filament coupled in series with each other and with a power source and having a variable impedance coupled across the secondary filament. The intensity of the multiple filament lamp is made comparatively bright when the value of the variable impedance is made comparatively low. Conversely, the intensity of the multiple filament lamp is made comparatively dim when the value of the variable impedance is made comparatively high.
17 Citations
20 Claims
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1. A multiple intensity lamp controller adapted to be coupled to a multiple filament lamp having at least a primary filament and a secondary filament coupled in series with each of other and to a power source, comprising a variable impedance coupled across said secondary filament wherein the intensity of said multiple filament lamp is comparatively bright when the valve of said variable impedance is comparatively low and wherein the intensity of said multiple filament lamp is comparatively dim when the value of said variable impedance is comparatively high;
- whereby any range of failure in the value of said variable impedance will result in said multiple filament lamp still being lit.
- View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A multiple intensity lighting system adapted to be coupled to a power source, comprising:
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a multiple filament lamp having at least a primary filament and a secondary filament coupled in series with each other and with said power source; and variable impedance means coupled across said secondary filament, said varaible impedance means for providing a variable impedance value, wherein the intensity of said mulitple filament lamp is comaratively bright when said impedance value is comparatively low and wherein the intensity of said multiple filament lamp is comparatively dim when said impedance value is comparatively high. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification