Scotopically enhanced emergency light and control thereof
First Claim
1. A light system comprising:
- a light source comprising at least one light emitting diode (LED); and
a controller that outputs a control signal to the LED to correspondingly vary luminous output of the LED,wherein the spectral output of the LED remains substantially unchanged scotopically when the luminous output of the LED is varied.
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Accused Products
Abstract
System and method are provided for controlling emergency lighting where emergency lights turn on when main source of power goes out for controlling emergency lighting to conserve energy utilized by the emergency light, while maintaining good visibility of the emergency lighting. Solid state lighting, such as LED, is used within an emergency light to add light in blue wavelength region matching the light output to the most sensitive of wavelength response of the human eve to increase color perception and allows faster response time. Electrical current to the device and light output are reduced while LED light tends to increase its blue wavelength component as it is dimmed thus increasing effective light output. After a predetermined time, the light is purposefully dimmed to conserve energy and to allow the eye to slowly and safely adjust to the new lighting conditions. By reducing electrical current, energy storage batteries may be smaller than for similar unit that maintains constant light output.
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Citations
20 Claims
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1. A light system comprising:
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a light source comprising at least one light emitting diode (LED); and a controller that outputs a control signal to the LED to correspondingly vary luminous output of the LED, wherein the spectral output of the LED remains substantially unchanged scotopically when the luminous output of the LED is varied. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A method for controlling output of light, the method comprising:
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outputting light from at least one light emitting diode (LED); generating a control signal supplied to the LED to correspondingly vary luminous output of the LED, wherein the spectral output of the LED remains substantially unchanged scotopically when the luminous output of the LED is varied. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20)
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Specification