Daylight harvesting is the use of a control system, such as DALI control, to reduce the use of artificial lighting in building interiors when natural daylight is available. Studies have shown that, by using daylight harvesting technologies, owners can obtain average annual energy savings of 24 percent. Daylight harvesting should form part of an overall lighting control initiative, along with high efficiency lighting ballasts and luminaires, and pre-programmed lighting schedules.
Daylight harvesting controllers include an integrated real-time clock with automatic daylight savings correction, sunrise and sunset calculation, and holiday exceptions. Control schedules can be configured in a daylight harvesting controller to automatically switch and vary lighting levels to harvest daylight and enforce energy savings. Sensors can be incorporated into the network to provide automatic dimming to compensate for the amount of natural light.
Additionally, many daylight harvesting controllers are equipped with reporting tools to provide the energy data needed to ensure a building is delivering on its energy targets and continuing to meet green building ratings. The installation of a daylight harvesting controller enables the maximisation of energy efficiencies and the achievement of higher energy efficiency ratings.
A strategic energy management plan helps ensure energy and cost savings don’t erode over time. Power meter installations, monitoring services, energy efficiency analysis and energy bill verification can all help achieve this.