LED lights have much longer lifespans: 50k to 100k hours, compared to ~30K hours for high pressure sodium lamps [1]. Reduced labour and parts costs could accoun

LED lights have much longer lifespans: 50k to 100k hours, compared to ~30K hours for high pressure sodium lamps [1]. Reduced labour and parts costs could account for the decision. Also, the referenced document shows LED lights as emitting 70 - 150 lm/W, so power consumption may be better than you think. [1] http://www.grahlighting.eu/en/street-lighting-technology-comparison http://www.grahlighting.eu/en/street-lighting-technology-com...