The domain of lighting is evolving and is now also part of the Internet of Things, hence light in our environment can now be controlled. An adaptive lighting system is a system that automatically adjusts its output and operation based on occupancy, daylight availability and other application-specific criteria. It can also be tuned in terms of light level and color to provide optimal lighting conditions. Adaptive lighting is now an integral part of any smart office and its major benefit is not only energy saving, rather it is the psychological effect of optimized lighting conditiond on the employees. Lighting control strategies vary and one or many of the following can be included in any office or building Lighting design:
∞ Bi-level Adaptive Lighting – Bi-level adaptive control is the most commonly used strategy for smart corridors. It utilizes an occupancy sensor to dim the luminaires after the space has been vacant for a set period of time. These sensors automatically turn lights up when an occupant is present in the sensor’s field of view. This strategy can be made more complex with scheduling, allowing for different high and low levels for the lighting during open hours and closed hours.
∞ High End Trim – This strategy saves energy by tuning the maximum allowable light level to a lower recommended level and setting this level as the maximum output of the system. ∞ Daylight Harvesting – Daylight harvesting controls allow the electric lights to scale their output based on the daylight contributions into a space. The electric lights dim or turn off during the day and return to full output only when needed.
∞ Scheduling – Scheduling allows luminaires to automatically turn on, off, or dim based on a preset schedule.
∞ Demand Response (DR) – DR is enacted in cooperation with local utilities to trim energy usage during peak hours or periods of critical demand. Some utilities have automated demand response programs that automatically signals advanced control systems to reduce lighting loads to predefined levels.
∞ Zoning – Zoning is the grouping of luminaires into functional areas. This can be accomplished through physical wiring or digitally through a networked control system. The zone of luminaires responds identically to occupancy and daylight signals.
∞ Dynamic contrast – Dynamic Contrast is the increase in the ratio between an illuminance target, such as a display, as compared to the general illuminance based on occupancy triggers, which draws occupant attention to the target.
∞ Dimming– This is a theoretical dimming scheme based on occupant density that could be applied to general illuminance levels, such as wall washers. When more occupants are in the store, the overall illumination can slowly be brightened.