Digital Lumens, Inc.

Northeastern University

Jesse F Kuhn

Frederick Marshall Morgan

Colin N Piepgras

Brian J Chemel

Steve T Kondo

Scott D Johnston

Matthew William Massicotte

John Francis Egan

Christopher L Elledge

Henry B Sick

Jay Seiter

Michael Witonis

Morgan Misek

Joshua Filgate

Matthew W Massicotte

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

A sequential planetary stack transmission system is provided. The system includes a stack of planetary gear sets, each gear set including a sun gear engageable with a rotatable central shaft, and freely rotatable concentrically about the central input or output shaft when not engaged with the central shaft. A plurality of planet gears engage with the sun gear, and a ring gear engages with the planet gears. The ring gears form a ring gear barrel rotatable as a unit concentrically with respect to the central shaft. A shifting assembly within the hollow central shaft engages sequentially with the sun gears to provide a desired gear ratio. The planetary stack assembly and the shifting assembly are disposed within a case. The system is suitable for a variety of applications, and is particularly suitable for bicycles.

Sequential planetary stack transmission system

Growing community of inventors

Somerville, MA, United States of America

Jesse F Kuhn