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Analysis on energy efficiency and optimality of LED and photovoltaic based street lighting system

Show simple item record Kulasooriyage, CS Namasivayam, SS Udaawatta, L 2015-08-24T11:56:24Z 2015-08-24T11:56:24Z 2015-08-24
dc.description.abstract This study evaluates the optimality and energy efficiency of Light Emitting Diode (LED) and Photovoltaic based street lighting systems as a part of energy conservation. This evaluation is based on the detailed review carried out through a country wide street lamp survey. Since LEDs are becoming increasingly competitive due to their rapidly increasing efficiencies and decreasing cost, this research assessed the LED fixtures which have the capability of achieving 50% to 70% energy saving potential compared to the existing established technologies based street lamps available in the country. As a case study, illumination levels were examined at two neighbouring traffic junctions in the Capital City, from Bambalapitiya junction to Kollupitiya junction. Two kinds of measurements were taken and average luminance levels were analysed for all measured points in the traffic lanes. It was found that same lighting performance could be achieved by replacing 250W HPS (High Pressure Sodium) by 150W HPS and further it was verified the same results while having 62% energy saving by replacing 250WHPS lamps with 111W LED through a simulation with Lighting RealityTM software. This change would easily meet the minimum recommended level of 7.5 Lux and average luminance of 0.5 cd/m2 as per British Standards. Even though solar powered street lighting systems need high capital outlay, it will be one of the most appropriate energy solutions for a country like Sri Lanka. Incentive program development by the government may further encourage LED street lamp and solar powered system development adoptions. This study also recommends that any such incentive program should include performance standards that consider warranty, efficacy and other important criteria as the next steps. en_US
dc.language.iso en en_US
dc.source.uri en_US
dc.subject Street lighting en_US
dc.subject Luminance metrics en_US
dc.subject Light Emitting Diode en_US
dc.subject Solar panels en_US
dc.subject Energy efficiency en_US
dc.title Analysis on energy efficiency and optimality of LED and photovoltaic based street lighting system en_US
dc.identifier.year 2015 en_US
dc.identifier.journal Engineer, Journal of the Institution of Engineers Sri Lanka (IESL) en_US
dc.identifier.issue 01 en_US
dc.identifier.volume XLVIII en_US
dc.identifier.pgnos pp. 11-20 en_US

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