Why is DALI particularly advantageous for daylight harvesting projects?
Daylight harvesting entails switching or dimming lighting systems in response to available daylight in a space. However, the amount of daylight varies according to distance from the daylight aperture. As a result, dimming the light fixtures around a daylight aperture together can result in some spaces having a higher or lower light level than required. To address this, a higher degree of granularity is required. Designers may set up fixtures adjacent to a window, for example, on parallel circuits so that the fixtures closest to the window are controlled separately from the next farthest row, and so on. This strategy maximizes energy savings and assures the right amount of light. With a DALI-based control system, each ballast or fixture can be designated as its own control zone, up to 16 zones. The granularity of the lighting is therefore limited only by this number and the number of photosensors the designer wishes to add. Higher granularity delivers the potential for even greater ener
