Load control system having a visible light sensor

A method of measuring a light level in a space with a sensor comprising a low-energy occupancy sensing circuit configured to detect infrared energy in the space and a visible light sensing circuit configured to record images of the space, the method comprising:

• detecting an occupancy condition in the space via the low-energy occupancy sensing circuit;
• enabling the visible lighting sensing circuit in response to the low-energy occupancy sensing circuit detecting the occupancy condition in the space;
• recording an image of the space via the visible light sensing circuit;
• focusing on a region of interest in the image of the space;
• and
• measuring the light level in the region of interest in response to the visible light sensing circuit when the visible light sensing circuit is enabled.

At least one computer-readable medium having instructions stored thereon, wherein the instructions are configured, when executed by at least one control circuit, to cause the at least one control circuit to:

• enable a visible lighting sensing circuit in response to a low-energy occupancy sensing circuit detecting an occupancy condition in the space;
• retrieve an image of the space recorded via the visible light sensing circuit;
• focus on a region of interest in the image of the space;
• and
• measure a light level in the region of interest in response to the visible light sensing circuit when the visible light sensing circuit is enabled.