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


Chandana S. Kulasooriyage ,

Ceylon Electricity Board, LK
About Chandana
Electrical Engineer, M.Sc. Eng.(Moratuwa), MIE(Sri Lanka), MIIE(Sri Lanka), GCGI(UK), C.Eng.,I. Eng.
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Satish S. Namasivayam,

Department of Electrical Engineering, University of Moratuwa, LK
About Satish
Dr. B.Sc.(Hons)(Colombo), M.Phil.(Colombo) , FilLic (Uppsala) Ph.D. (Uppsala) , M.B.A ( Colombo)
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Lanka Udawatta

Faculty of Mechatronics Engineering, Higher Colleges of Technology, AE
About Lanka
Dr, B.Sc. Eng. (Moratuwa), M.Sc. (Saito), PhD. (Saito)
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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 neighboring 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/m2as 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.


ENGINEER, Vol. 48, No.01, pp. 11-20, 2015

How to Cite: Kulasooriyage, C.S., Namasivayam, S.S. and Udawatta, L., 2015. Analysis on energy efficiency and optimality of LED and photovoltaic based street lighting system. Engineer: Journal of the Institution of Engineers, Sri Lanka, 48(1), pp.11–20. DOI:
Published on 23 Jan 2015.
Peer Reviewed


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