Two step algorithm implementation forintelligent street light system

Abstract

This paper presents an algorithm for the automation of street lights for existing urban roads in India. In thiscase study a two kilometre lane in Chennai, India is taken under consideration. The paper proposes replacing the existingHigh Pressure Sodium VapourLamps (HPS) with Light Emitting Diodes (LED). A smart algorithm is fed into the system design incorporating phototransistor and Infrared sensors. The opera-tion time of the street lights can be categorised as High Passerby Frequency(HPF)andLowPasserbyFrequency(LPF)period.The Dynamic Intensity Modification (DIM) system operates during LPF duration hence, when passerby is detected the street is illuminated to maximal intensity which otherwise is maintained at low intensity consuming low power resulting in low cost.For the 2 km stretch, the results highlight that replacing all existing lamps with LEDs and dimming light intensity in the absence of users in the vicinity of the lamp-post is convenient and provides minimum of 65.74% and a maximum of 72.9% relative reduction in cost for a period of twenty years for this specific case study. However, the DIM algorithm is generic and can be implemented across any Indianroadway.