Photosensor and control system for dimming lighting fixtures to reduce power consumption

摘要

A lighting control system provides a desired illumination level at a task location while saving power. Controlled electric light is produced having an intensity responsive to a control signal. The system comprises at least one light fixture and a photosensor that is configured to provide the control signal to the light fixture. The control signal is responsive to an illumination level at a sensor location and ratios of illumination levels at the sensor location to task location for uncontrolled (e.g., solar) light and controlled electric light. The photosensor has the ability to self-commission. In one embodiment, the photosensor includes a self-powered photocell unit that transmits a wireless sensor signal responsive to the illumination level at the photocell unit. This photocell unit can be moved for use at different locations during photosensor commissioning.