United States Department of Transportation
i
Analysis of energy efficient highway lighting retrofits.
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2015-06-01
[PDF-1.36 MB]
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Abstract:Solid state lighting technology is advancing rapidly to a point where light emitting diode (LED) lighting
systems can be viable replacements for existing lighting systems using high pressure sodium (HPS). The
present report summarizes analyses conducted to document existing lighting conditions along a parkway
(Southern State Parkway, Long Island) and an arterial roadway (Central Avenue, Albany County). Several
LED alternative lighting systems were compared using photometric analyses to identify ones that meet light
level criteria for each roadway type; several options were available that resulted in energy savings compared to
the existing HPS lighting systems. Energy economic analyses confirmed that the initial investment could be
paid back in terms of reduced operating costs, and that energy savings were larger for LED systems when
compared to HPS systems that produced similar levels to those from the LED alternatives. Further energy cost
savings would be expected with the use of adaptive lighting controls specified to take advantage of temporal
nighttime traffic patterns on the roadways investigated. The report concludes with considerations for
incorporating LED performance characteristics, such as ensuring they do not produce interference with radio
equipment, into specifications for LED retrofit alternatives.
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