Page 195 - Solar Power in Building Design The Engineer's Complete Design Resource

OUTDOOR LIGHTING AND SIGNS 165

OUTDOOR LIGHTING ENERGY TRADEOFFS

Outdoor lighting tradeoffs are allowed only between the lighting applications with
general site lighting illumination, which includes hardscape areas, building entrances
without canopies, and outdoor sales lots. The requirements do not permit any trade-
offs between outdoor lighting power allowances and interior lighting, HVAC, building
envelope, or water heating. This includes decorative gas lighting; lighting for theatri-
cal purposes, including stage, film, and video production; and emergency lighting
powered by an emergency source as defined by the CEC.

SUMMARY OF MANDATORY MEASURES
The imposed mandatory measures on outdoor lighting include automatic controls that
are designed to turn off outdoor lighting during daytime hours and during other times
when it is not needed. The measures also require that all controls be certified by the
manufacturer and listed in CEC directories. All luminaires with lamps larger than
175 W are required to have cutoff baffles so as to limit the light directed toward the
ground. Luminaires with lamps larger than 60 W are also required to be high efficiency
or controlled by a motion sensor.
The new CEC standards also limit the lighting power for general site illumination
and for some specific outdoor lighting applications. General site illuminations specif-
ically include lighting for parking lots, driveways, walkways, building entrances,
sales lots, and other paved areas of a site. The measures also provide separate
allowances for each of the previously referenced general site lighting applications
and allow tradeoffs among these applications. In other words, a single aggregate out-
door lighting budget can be calculated for all the site applications together.
Hardscape for automotive vehicular use, including parking lots; driveways and site
roads; and pedestrian walkways, including plazas, sidewalks, and bikeways, are all
considered general site lighting applications.
General site lighting also includes that for building entrances and facades such
as outdoor sales lots, building facades, outdoor sales frontages, service station
canopies, vehicle service station hardscape, other nonsales canopies, ornamental
lightings, drive-up windows, guarded facilities, outdoor dining, and temporary out-
door lighting. Site lighting is also regulated by the Federal Aviation Regulation
Standards.
General lighting standards also cover lighting of sports and athletic fields, children’s
playgrounds, industrial sites, automated teller machines (ATMs), public monuments,
swimming pools or water features, tunnels, bridges, stairs, and ramps. Tradeoffs are
not permitted for specific application lighting.
Allowable lighting power for both general site illumination and specific applica-
tions are governed by four separate outdoor lighting zone requirements, as will be
described later. The lighting zones in general characterize ambient lighting intensities
in the surrounding areas. For example, sites that have high ambient lighting levels have
a larger allowance than sites with lower ambient lighting levels. The following are
Title 24 CEC zone classifications: