Abstract: A daylight harvesting system includes a daylight harvester device that distinguishes the natural and artificial contributions to the light in a workspace. Distinguishing the contributions allows the values of the contributions to be combined in ways other than linearly summing them to obtain the total light. For example, when the natural light increases, the artificial light may be reduced by less than the natural-light increase to mitigate glare and/or shadows and other artifacts that might otherwise be present and objectionable. The daylight harvesting system can include a human-based sensor located in a workspace, e.g., on or close to a user, so the measurements it takes are not adversely affected by spatial variations across a room in the natural and artificial lighting.

Abstract: A daylight harvesting system includes a daylight harvester device that distinguishes the natural and artificial contributions to the light in a workspace. Distinguishing the contributions allows the values of the contributions to be combined in ways other than linearly summing them to obtain the total light. For example, when the natural light increases, the artificial light may be reduced by less than the natural-light increase to mitigate glare and/or shadows and other artifacts that might otherwise be present and objectionable. The daylight harvesting system can include a human-based sensor located in a workspace, e.g., on or close to a user, so the measurements it takes are not adversely affected by spatial variations across a room in the natural and artificial lighting.

Abstract: A daylight harvesting system includes a daylight harvester device that distinguishes the natural and artificial contributions to the light in a workspace. Distinguishing the contributions allows the values of the contributions to be combined in ways other than linearly summing them to obtain the total light. For example, when the natural light increases, the artificial light may be reduced by less than the natural-light increase to mitigate glare and/or shadows and other artifacts that might otherwise be present and objectionable. The daylight harvesting system can include a human-based sensor located in a workspace, e.g., on or close to a user, so the measurements it takes are not adversely affected by spatial variations across a room in the natural and artificial lighting.

Abstract: A lighting system including fixture lamps, e.g., ceiling mounted, and movable light sources, e.g., task lamps. The task lamps include illuminance sensors arranged to detect ambient light including light emitted by one or more fixture lamps and available daylight. Control data is generated based at least in part on the illuminance data. The resulting control data is transmitted from the task lamp to a fixture lamp and a window system so that it can be used to control the amount of light emitted by the fixture lamp and amount of daylight transmitted through the window system. This arrangement allows daylight harvesting while ensuring that the amount of light provided to workspaces (at which task lamps are located) is satisfactory.