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Streetlights for Local Roads

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Streetlights for Local Roads The objective source of lighting product information Streetlights for Local Roads Volume 14 Number 1, February 2011 About NLPIP The National Lighting Product Information Program (NLPIP) was established in 1990 and is administered by the Lighting Research Center (LRC). NLPIP’s mission is to help lighting specifi ers and other lighting decision-makers by providing the most complete, up-to-date, objective, Program Sponsors manufacturer-specifi c information available on energy-effi cient lighting products. Priority is given to information not available or easily accessible CEATI International Inc. from other sources. NLPIP tests lighting products according to accepted Lighting Research Center industry procedures or, if such procedures are not available or applicable, NLPIP develops interim tests that focus on performance issues important to New York State Energy Research specifi ers or end users. and Development Authority In 1998, NLPIP Online debuted at www.lrc.rpi.edu/programs/nlpip, United States Environmental making the information provided by NLPIP even more accessible to Protection Agency lighting specifi ers and other interested people. NLPIP Online includes PDF fi les of Specifi er Reports, Lighting Answers, and Lighting Diagnostics. NLPIP does not accept funding from manufacturers. No portion of this publication or the information contained herein may be duplicated or excerpted in any way in other publications, databases, or any other medium without express written permission of the publisher. Making copies of all or part of this publication for any purpose other than for undistributed personal use is a violation of United States copyright laws. It is against the law to inaccurately present information extracted from Specifi er Reports for product publicity purposes. Information in these reports may not be reproduced without permission of Rensselaer Polytechnic Institute. The products described herein have not been tested for safety. The Lighting Research Center and Rensselaer Polytechnic Institute make no representations whatsoever with regard to safety of products, in whatever form or combination used, and the results of testing set forth for your information cannot be regarded as a representation that the products are or are not safe to use in any specifi c situation, or that the particular product you purchase will conform to the results found in this report. Products tested by the National Lighting Product Information Program may thereafter be used by the Lighting Research Center for research or any other purposes. ISSN 1067-2451 © 2011 Rensselaer Polytechnic Institute. All rights reserved. 2 Specifi er Reports: Streetlights for Local Roads Volume 14 Number 1 February 2011 Streetlights for Local Roads Contents Abstract ........................................................................................................4 Introduction ..................................................................................................6 Streetlight Selection ......................................................................................7 Identifying the Base Case Criteria..................................................................7 Identifying Brands to Purchase .....................................................................7 Identifying Streetlight Models to Purchase ......................................................8 Pole Spacing .................................................................................................8 Method ....................................................................................................8 Maximum Pole Spacing Results from NLPIP Testing .........................................9 Power Demand ...........................................................................................10 Economics ..................................................................................................11 Labeling Problems ......................................................................................13 Additional Analyses .....................................................................................13 White Light Benefits .................................................................................13 Discomfort Glare ......................................................................................14 Absolute Photometry ................................................................................14 Manufacturer-supplied Photometric Data ......................................................14 Established Pole Spacing Results Using Higher Light Output Streetlights ...........15 Higher Mounting Heights ...........................................................................15 Wider Roads ...........................................................................................16 Economic Effects of Volume Pricing ............................................................16 Limitations .................................................................................................17 Conclusions .................................................................................................17 Appendix A: Data Sheets .............................................................................18 Further Information ....................................................................................25 Specifi er Reports: Streetlights for Local Roads 3 Abstract Between February and March 2010, the National Lighting Product Information Program (NLPIP) at Rensselaer Polytechnic Institute’s Lighting Research Center purchased six streetlights identifi ed by manufacturer representatives as equivalent to a 100-watt (W) high pressure sodium (HPS), Type II, medium, full cutoff co- bra head. One used an HPS lamp (the base case model), one used an induction lamp, and four used light-emitting diode (LED) modules. NLPIP determined how many of each type of streetlight were needed to illuminate one mile (1.6 ki- lometer) of a local road in an urban residential area to meet the roadway lighting design criteria specifi ed in the American National Standards Institute (ANSI)/ Illuminating Engineering Society of North America (IESNA) RP-8-00, Ameri- can National Standard Practice for Roadway Lighting (referred to as RP-8 below). NLPIP then calculated power demand and life-cycle costs per mile for each streetlight. For a more complete understanding of this application, additional analyses were conducted related to white light benefi ts, discomfort glare, absolute photometry, manufacturer-supplied photometric data, higher light output street- lights, higher mounting heights, wider roads, and volume discount pricing. Using a GE Lighting 100 W HPS streetlight as the tested base case, NLPIP found that: • The tested LED streetlights required 3% to 92% (average 40%) more poles per mile than the base case to meet the RP-8 design criteria. The tested GE Lighting induction streetlight required 64% more poles per mile than the base case to meet the RP-8 criteria. One tested LED streetlight, the Beta Lighting STR-LWY-2M-HT-04-C-UL-SV, was able to provide pole spac- ing similar to the base case. • The tested LED streetlights required 41% less to 15% more power per mile than the base case (average 6% less per mile for a staggered layout and 24% less per mile for a single-sided layout) to meet the RP-8 criteria. The tested induction streetlight required 51% and 41% more power per mile than the base case in staggered and single-sided layouts, respectively, to meet the RP-8 criteria. • The life-cycle costs per mile for all of the tested streetlights were domi- nated by the capital and installation cost of the poles and streetlights. The life-cycle costs per mile of the tested LED streetlights ranged from 0.98 to 2.84 times as much as the base case because of the pole spacing required by the tested LED and induction streetlights to meet RP-8. For an assumed LED module replacement interval of 25,000 hours, the average tested LED streetlight life-cycle cost per mile was 1.9 times that of the base case. For an assumed LED module replacement interval of 50,000 hours, the average tested LED streetlight life-cycle cost per mile was 1.6 times that of the base case. The average life-cycle cost per mile of the tested induction streetlight was 1.8 times that of the base case. • NLPIP identifi ed one tested LED streetlight that met RP-8 and could have a lower life-cycle cost per mile than the base case in one scenario largely because its pole spacing was close to that of the base case, and therefore, had a similar pole cost. With a volume discount of 50% for the streetlights and replacement modules (and lamps for the base case), the tested Beta Lighting STR-LWY-2M-HT-04-C-UL-SV streetlight in a single-sided lay- out would have a lower life-cycle cost per mile than the base case if it were to have a life of 50,000 hours (12 years) or longer (or at single-unit pricing, 113,000 hours [27 years] or longer). • Some streetlight system owners may be able to obtain fi nancial incentives for installing LED and induction streetlights. In order for the tested LED 4 Specifi er Reports: Streetlights for Local Roads (with a life of 25,000 hours or longer) or induction streetlight systems to have a lower life-cycle cost per mile than the base case, the required incen- tives would have to range from $250 to $1,550 per streetlight, in addition to a volume pricing discount. • At the RP-8 local road illuminance levels, additional power reductions of up to 15% were possible for the LED and induction streetlights
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