Marker lights for wireless doorbell transmitters and other devices
First Claim
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1. A marker luminaire comprising:
- a housing having an exterior and an interior;
a light emitting diode located in the interior of the housing;
a light transmitting element optically coupled with the light emitting diode and having a visible surface open on the exterior of the housing through which light is visible over a broad angle viewing angle; and
a low current level energization circuit operably connected to the light emitting diode for supplying current to the light emitting diode to cause the light emitting diode to illuminate the visible surface of the light transmitting element at an intensity level below a useful threshold of human photopic vision and above a threshold of scotopic vision.
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Abstract
Battery powered LEDs operated at a small fraction of their rated capacity to provide a level of illumination useful as a marker for darkness adjusted vision. Long battery life is achieved using super bright, broad spectrum LEDs.
25 Citations
36 Claims
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1. A marker luminaire comprising:
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a housing having an exterior and an interior; a light emitting diode located in the interior of the housing; a light transmitting element optically coupled with the light emitting diode and having a visible surface open on the exterior of the housing through which light is visible over a broad angle viewing angle; and a low current level energization circuit operably connected to the light emitting diode for supplying current to the light emitting diode to cause the light emitting diode to illuminate the visible surface of the light transmitting element at an intensity level below a useful threshold of human photopic vision and above a threshold of scotopic vision. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26)
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27. A lamp comprising:
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a housing; a battery located in the housing; a light emitting diode in the housing, the light emitting diode being of a type exhibiting high efficiency in light generation across a substantial drive current operating range and with increasing intensity as drive current increases, including light emission levels above a threshold of darkness adapted human vision and below a threshold of useful photopic vision at a threshold current; a light scattering element optically coupled to the light emitting diode for transmitting and scattering light from the light emitting diode outside the housing; and diode drive circuitry connected to the battery to draw power therefrom and further connected to the light emitting diode to deliver drive currents to the light emitting diode sufficient to illuminate the light scattering element above the threshold of darkness adapted human vision but below the threshold of useful photopic vision. - View Dependent Claims (28, 29, 30, 31, 32)
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33. A luminaire comprising:
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a housing; a light scattering illumination source including a light emitting element for emitting light at a threshold current at an intensity level visible to a human eye adapted for light intensity levels below those required for photopic vision, the light scattering illumination source being mounted with respect to the housing to mark the location of the housing, when illuminated, over a wide viewing angle; and an electrical energization circuit supplying the threshold current to the light emitting element of the light scattering illumination source. - View Dependent Claims (34, 35, 36)
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Specification