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Photosensors might be limited in the range of light levels they can detect. They perform dusk and dawn lighting control at fewer than 10 footcandles (fc), they control daylit offices at less than 100 fc, and they control atrium spaces at fewer than 1,000 fc. Skylight sensors see up to 10,000 fc of sunlight.
Below are several typical light-level ranges photosensors detect for specific applications:
"Lighting designers should ensure that the range of response of the photosensor matches the light levels likely to be found in the area of installation," says Solayappan Alagappan, design engineer with Philips.
Managers can ensure success when specifying photosensor technology by getting answers to essential questions:
Lighting Controls: A Look at Daylight Harvesting
Photosensors: What Are Typical Light-Level Ranges?
Daylight Harvesting: The Importance of Signal Resolution