Daylightresponsive

Daylightresponsive, in the context of lighting and building automation, describes systems that adjust artificial lighting in response to available daylight. The goal is to maintain specified illumination levels while reducing energy use and optimizing human comfort.

The core components are daylight sensors (photosensors or lux sensors) that measure ambient light, a controller, and dimmable lighting equipment. The sensor data is used by the controller to vary lighting power, often through continuous dimming or stepped control. Daylight-responsive systems can operate alone or as part of an integrated building management system and may also consider occupancy and time schedules.

Applications include offices, schools, retail spaces, and outdoor street or area lighting. Common strategies include daylight harvesting (proportional dimming based on daylight levels), bi-level or multi-level dimming, and top-up lighting during occupancy. Calibration and commissioning are important to set target illuminance levels and to account for daylight distribution, glare, and shading.

Benefits include energy savings, reduced peak demand, and improved visual comfort when daylight is properly managed. Challenges include sensor placement, maintenance, drift in sensor sensitivity, interference from direct sunlight, and integration with other controls.

Related terms include daylight harvesting and daylight-linked lighting control. Standards and guidelines vary by region, but many programs emphasize energy performance and occupant comfort in daylight-responsive designs.