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LED street lighting evaluation -- phase II : LED specification and life-cycle cost analysis.
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2015-01-01
[PDF-4.58 MB]
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Abstract:Phase II of this study focused on developing a draft specification for LED luminaires to be used by IDOT
and a life-cycle cost analysis (LCCA) tool for solid state lighting technologies. The team also researched the
latest developments related to dirt depreciation factors for LED luminaires and other general developments
on solid state lighting. A final draft specification was developed that included best practices from states and
cities that already had their own specification, as well as feedback from several state DOTs staff, a few
experts in roadway lighting, and six LED luminaire manufacturers. This process is recommended for the
development of future specifications. A spreadsheet to conduct LCCA based on net present value was also
developed. The spreadsheet contains unit costs of typical items used in roadway lighting projects, and it is
completely customizable by the user. The life-cycle cost of HPS, LED, plasma, and induction lighting
designs can be compared side by side in the output table. There are significant trade-offs between larger
initial investments for LED and lower maintenance/light consumption costs over the life of the project.
Presently, LED lighting does not offer significant cost advantages over other technologies used in highway
lighting in most of the four scenarios analyzed. However, assuming re-lamping and re-ballasting cycles of 4
years for HPS, and a cost of $845 per LED luminaire (half of current cost reported by IDOT), HPS and LED
produced the most economical lighting solutions with the exception of the conventional interchange project
in which LED was 8.3% more expensive than HPS. Ongoing dirt depreciation research and trends in the
lighting industry, such as adaptive lighting, should be monitored to take advantage of developments and to
ensure that the most qualified products are specified and purchased. In addition to LCCA, other factors may
also be considered in deciding which type of luminaires to use.
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