What Is a Daylight Harvesting Lighting Control?
Daylight harvesting dims or switches the electric lights in response to the available daylight — the photosensors measuring the light, the controllers reducing the electric, the energy saved (the 30-60% lighting reduction in the daylit zones). The design: the sensor placement (the seeing the daylight, not the electric), the zoning (the daylit vs. the interior), and the commissioning (the calibration — the savings realized). The daylighting's electrical complement.
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How harvesting works
The photosensors (the ceiling — the measuring; the open-loop vs. the closed-loop — the seeing the daylight only or the total), the control (the dimming — the continuous; the switching — the stepped; the ballasts/drivers — the dimmable), and the zones (the sidelighting — the 15-foot depth; the toplighting — the skylight's area).
Design details
The sensor placement (the manufacturer's — the geometry; the commissioning — the aiming), the setpoints (the maintained illuminance — the task's; the deadband — the cycling avoided), the override (the occupant — the acceptance), and the integration (the shades — the coordinated; the BMS — the monitoring).
Codes and savings
The energy codes (the IECC/ASHRAE 90.1 — the mandatory in the daylit zones; the skylight and the sidelighting thresholds), the savings (the 30-60% — the daylit zones'; the commissioning's — the realized), and the cost (the sensors and the dimming — the premium; the payback — the 2-5 years). The harvesting is the daylighting's ROI — the controls capturing the free light.
The bottom line
Daylight harvesting (photosensors dimming electric lights in daylit zones per IECC/ASHRAE 90.1) saves 30-60% of lighting energy — place sensors per manufacturer geometry and commission setpoints.
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