LED-based luminaire utilizing optical feedback color and intensity control scheme
First Claim
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1. A lighting system, comprising:
- a plurality of luminaires;
an input device through which a predetermined light setting is selected for each of the luminaires;
a databus communicatively linking the input device to each of the luminaires, such that the predetermined light settings are digitally transmitted via the databus to the respective luminaires,wherein each luminaire comprises;
an emitter module including a light-emitting diode (LED)-based light source, the emitter module including at least one color channel;
an optical sensor configured to periodically produce a measured output by measuring an intensity output of the emitter module; and
a regulating device configured to regulate current delivered to each color channel in the emitter module based on a comparison of the periodic measured outputs of the emitter module to the respective predetermined light setting,wherein the emitter module includes a plurality of color channels, each color channel including at least one LED, and the optical sensor is configured to produce the measured output by measuring an individual intensity output for each of a plurality of colors corresponding to the color channels.
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Abstract
A system and method for implementing an LED-based luminaire (100) incorporates one or more color channels (32-n). The luminaire includes a controller (50) that uses optical sensing and feedback to control LEDs (30A) in each channel to deliver a consistent intensity and/or color output. The optical feedback loop may provide measured intensity and/or color of the luminaire'"'"'s output to the luminaire controller. The controller may then adjust the current, pulse width modulation (PWM) duty cycle, or both, which are delivered to discrete color channels of the luminaire to obtain the desired intensity and/or color.
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Citations
19 Claims
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1. A lighting system, comprising:
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a plurality of luminaires; an input device through which a predetermined light setting is selected for each of the luminaires; a databus communicatively linking the input device to each of the luminaires, such that the predetermined light settings are digitally transmitted via the databus to the respective luminaires, wherein each luminaire comprises; an emitter module including a light-emitting diode (LED)-based light source, the emitter module including at least one color channel; an optical sensor configured to periodically produce a measured output by measuring an intensity output of the emitter module; and a regulating device configured to regulate current delivered to each color channel in the emitter module based on a comparison of the periodic measured outputs of the emitter module to the respective predetermined light setting, wherein the emitter module includes a plurality of color channels, each color channel including at least one LED, and the optical sensor is configured to produce the measured output by measuring an individual intensity output for each of a plurality of colors corresponding to the color channels. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. An aircraft cabin luminaire comprising:
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a light-emitting device including a plurality of color channels, each color channel including at least one light source; an optical sensor configured to produce a measured output by measuring an intensity output for each of a plurality of colors corresponding to the plurality of color channels of the light-emitting device; a regulating device configured to regulate current delivered to each color channel in the light-emitting device based on a comparison of the measured output of the light-emitting device to a selectable predetermined light setting; and a housing configured to secure the light-emitting device, optical sensor, and regulating device to a ceiling or sidewall of an aircraft cabin. - View Dependent Claims (18)
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19. A lighting system, comprising:
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a plurality of luminaires; an input device through which a predetermined light setting is selected for each of the luminaires; a databus communicatively linking the input device to each of the luminaires, such that the predetermined light settings are digitally transmitted via the databus to the respective luminaires, wherein each luminaire comprises; a light-emitting device including at least one color channel; an optical sensor configured to periodically produce a measured output by measuring an intensity output of the light-emitting device; and a regulating device configured to regulate current delivered to each color channel in the light-emitting device based on a comparison of the periodic measured outputs of the light-emitting device to the respective predetermined light setting, wherein, each of the luminaires includes a control device configured to; analyze an address segment in a message packet transmitted on the data bus to determine whether the message packet is pertinent to the luminaire; if the message packet is pertinent, extract the selected predetermined light setting from a data segment in the message packet; and generate the control signal sent to the regulating device based on the extracted predetermined light setting.
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Specification