Digital Lumens, Inc.

Aware, Inc.

Osram Sylvania Inc.

Christopher L Elledge

Frederick Marshall Morgan

John Francis Egan

Brian J Chemel

Scott D Johnston

Colin N Piepgras

Steve T Kondo

Matthew William Massicotte

Richard W DeVaul

Jesse F Kuhn

Daniel Barkalow

Henry B Sick

John F Egan

Hugh Medal

Matthew W Massicotte

Frederick M Morgan

Brian Chemel

A presence or an absence of an occupant is detected, and an occupancy sensor signal is generated representative of an active state in which the presence of the occupant is detected, and an inactive state in which the absence of the occupant is detected. An ambient light sensor detects the ambient light level and generates an ambient light sensor signal representative of the ambient light level. Dimmable illumination is generated at a first dimming level, based on the ambient light level, corresponding to the active state and a second dimming level corresponding to the inactive state. A transition delay time between an onset of the inactive state and a transition between the first dimming level and the second dimming level may be controlled. The first dimming level, the second dimming level, and/or the transition delay time may be variably set or controlled locally or via a remote device.

Methods, apparatus and systems for providing occupancy-based variable lighting

Methods, apparatus, and systems for providing occupancy-based variable lighting

An ambient light sensor measures an ambient light level at one point in an illuminated environment, such as a warehouse, office, shop, cold-storage facility, or industrial facility, and provides an indication of the measured ambient light level to a processor. The processor maps the measured ambient light level to an estimated ambient light level at a different point in the illuminated environment from the measured ambient light level (e.g., a 'task height' about three feet from a warehouse floor). The processor may determine the difference between the estimated ambient light level and a desired light level at the task height, and may change the artificial illumination provided by a light fixture to make the actual ambient light level at task height match the desired light level at the task height.

Methods, systems, and apparatus for intelligent lighting

Light-emitting diodes (LEDs) generate light more efficiently than high-intensity discharge lamps or high-intensity fluorescent lamps. Driving a series of LEDs with a constant-voltage primary supply and a low-voltage LED driver keeps efficiency high. Unfortunately, LED forward voltage varies as a function of temperature: at low temperature, the forward voltage rises. Placing the LEDs in series magnifies the forward voltage increases. This makes it difficult to drive a series of LEDs at low temperature with a constant-voltage supply because the forward voltage can exceed the power supply voltage. To account for this behavior, an exemplary LED lighting fixture includes a 'bypass' circuit that, when engaged, effectively removes at least one LED from each series string of LEDs to bring the total forward voltage below the power supply voltage. The low-voltage driver circuit monitors temperature, and engages the 'bypass' circuit when necessary to ensure that DC voltage is not exceeded.

Methods, apparatuses, and systems for operating light emitting diodes at low temperature

A method to achieve an accurate, extremely low power state classification implementation is disclosed. Embodiments include a sequence that matches the data flow from the sensor transducer, through analog filtering, to digital sampling, feature computation, and classification.

Method and system for real-time signal classification

Growing community of inventors

Arlington, MA, United States of America

Christopher L Elledge