Methods, systems, and apparatus for intelligent lighting

摘要

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.

主权项

1. A lighting fixture to illuminate an environment, the lighting fixture comprising:
A) a memory to store a first transfer function mapping a first ambient light level at a first position within the environment to a corresponding second ambient light level at a second position within the environment, wherein the first position is at the lighting fixture and the second position is at a task height within the environment; B) an ambient light sensor located at the first position within the environment to measure an actual ambient light level at the first position within the environment; C) a processor, communicatively coupled to the memory and the ambient light sensor, to determine:
C1) an expected ambient light level at the second position within the environment, based on the actual ambient light level measured at the first position within the environment and the first transfer function stored in the memory; andC2) a change in a light output of the lighting fixture to provide a desired ambient light level at the second position within the environment, based at least in part on the expected ambient light level at the second position within the environment; and D) at least one light source, communicatively coupled to the processor, to generate the change in the light output of the lighting fixture so as to provide the desired ambient light level at the second position within the environment.