Cable cost algorithm: Traditional 10 kilometer street light cable current I=700 * 250W/220V ≈ 800A, requires a cross-sectional area of 400mm2 copper core cable, unit price of 360 yuan/meter, cable cost of 360 * 10000=360000 yuan, LED street light cable current I=700 * 50W/220V ≈ 150A, requires a cross-sectional area of 40mm2 copper core cable, unit price of 60 yuan/meter, cost of 600000 yuan

Power consumption cost: The calculation method is based on lighting up for 10 hours per day, with each kWh calculated at 0.65 RMB. The total annual power consumption of traditional street lights is 700 * 250W * 365 * 10h * 0.65 ≈ 415187 (kilowatt hour) kWh, while the total annual power consumption of LED street lights is 700 * 50W * 365 * 10h * 0.65=83037 (kilowatt hour) kWh, which is 83037 RMB.

Compared to traditional streetlights, the lifespan of LED streetlights is over 40000 hours, which is equivalent to more than 5 times the lifespan of the best circulating high-pressure sodium lamps today. When replacing high-pressure sodium lamps more than 5 times, LED streetlights only need to be replaced once, resulting in light source costs, maintenance, and other expenses. From the above analysis, it can be seen that the longer the installed road, the better the cost-effectiveness of traditional and LED street lights.

With the continuous development of LED technology, the cost-effectiveness of LED continues to rise. LED light sources are gradually replacing various traditional lighting sources to achieve semiconductor green lighting, which is not far away!