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Exterior
Lighting
Today, issues like sky glow, light trespass, glare, over lighting and
wasted energy are increasingly the subject of codes and legislation.
While much depends on luminaire selection, lamps and design practices,
the use of effective lighting controls can have a significant impact on
a number of these issues.
The
International Dark Sky Association estimates that more than $1 billion
is wasted each year on unnecessary energy use for outdoor lighting.
While much of this is attributed to lamp and fixture issues, turning off
lighting when it is not required saves a substantial amount of energy
and reduces sky glow.
The use
of simple dusk-to-dawn controls eliminates the waste of burning lighting
during daylight hours, but falls short of maximizing the savings that
are available. The Synergy system can turn on exterior lighting at dusk,
then stage lighting off over time to suit security requirements as
employees leave the property.
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Dusk to Time Operation
The exterior and site lighting is
automatically turned on in the evening by the schedule. An astronomic
feature in the logic allows the system to calculate sunrise and sunset times
for the local area. All exterior lighting is utilized during early evening
hours. Later, most of the exterior lighting is turned off by the schedule to
conserve energy and reduce sky glow. |
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Adjusts to Environmental
Conditions
Stormy or overcast conditions may call for exterior lighting and signage to
turn on earlier than scheduled. A building-mounted photocell monitors these
conditions and passes light-level information to the Synergy control system.
On weekends and holidays, photocell overrides are ignored.
Because the site lighting is spread out over
a large area, multi-pole lighting circuits are required to efficiently
distribute power to the lighting poles. The Synergy relay panel provides
integral control of multi-pole circuits without external contactors. |
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