Duke Energy Center utilizes a lighting control system designed to reduce energy consumption by dimming perimeter lights in response to available natural light, turning tenant lights off during Non-Occupied hours and turning lights off in all enclosed rooms when unoccupied regardless of the time of day.
All Tenant lights located within 15 feet of any perimeter windows are dimmable and are controlled by a daylight sensor that will dim the lights in relation to the natural light available. The daylight sensor establishes a maximum light level that cannot be exceeded. Wall Switches allow occupants to dim lights in offices and specialty areas below the maximum level, but light levels cannot be increased above the default maximum light level.
Offices: Offices are designed to operate in a Vacancy Mode, meaning that the lights will always be off unless the office is occupied. Upon entering the office, the occupant must physically push a button on the wall switch to turn on the lights. Perimeter offices are programmed this way as an energy saving measure to guard against the sensitive occupancy sensors in each office turning the lights on unintentionally when someone walks by an empty office. If the office is unoccupied, the occupancy sensor will turn the lights off after a pre-determined period of time. As long as someone is occupying an office, the occupancy sensors will use a combination of motion and heat to recognize the presence of a person, thereby keeping the lights on. The lighting control system for perimeter offices is setup in a Self-Learning Mode where the system learns occupant behavior over time and automatically adjusts how long the office must be vacant before the lights turn off, anywhere from 8 to 45 minutes.
Open Spaces: Open spaces are larger spaces that would typically include areas with multiple workstations. Lights in open spaces are designed to turn on and stay on during Occupied Hours and turn off during Non-Occupied Hours. Occupied hours are 7:00 AM to 7:00 PM Monday – Friday and Non-Occupied Hours are all other hours on weekdays and all hours on weekends and holidays. During Non-Occupied Hours, lights in open spaces are operated in an Occupancy Mode and are controlled by zone occupancy sensors that turn lights on and off as needed by zone. If a person is occupying a portion of an open space during Non-Occupied hours, the lights in that zone will be on and stay on during the duration of the occupancy.
Specialty Areas: Specialty areas are spaces with custom lighting needs that could include audio-visual requirements or lighting scenes. These areas could include board rooms, conference centers, reception areas, galleries, work/copy rooms and other areas based on the tenant lighting design requirements. Although Specialty Areas are allowed some flexibility, generally they are designed to operate in Occupancy Mode like the Open Spaces. Specialty areas are also setup in a Self-Learning Mode that will adjust the period of time the room is vacant before the lights are shut-off.
For more information on the Lutron Ecosystem wall station operation, please click HERE
For more information on the building lighting policy, please click HERE