Exterior Lighting

Lighting tab in model data

Exterior lighting allows you to account for the energy consumption of lights used to illuminate the exterior of the building. Options are available for scheduled operation and nighttime switching.

Operation schedule

The schedule allows the exterior lights consumption to be operationally different, hour to hour as well as seasonally. Fractional values in the basic schedule are applied to the design level data below.

Design level

This data is normally used to represent the maximum electrical input to exterior lighting fixtures that is then multiplied by a schedule fraction (see previous field). Alternatively, the lighting design level could be a “diversity factor” applied to a schedule of real numbers.

Control Option

This data is used to determine how the exterior lights are controlled. There are currently two options:

• Schedule only where the exterior lights always follow the operation schedule.
• Schedule + override off on daytime where the exterior lights will not run when the sun is up, no matter what the schedule indicates. Using this option makes it simple to model exterior lights that are controlled by a photocell or other controller that ensures that outdoor lights will not run during the daytime. However, this control works off of the position of the sun and therefore does not operate exactly like a photocell. During the night, the schedule values are still applied in the usual way.