Los Angeles swapped 140,000 of its 210,000 streetlights for LEDs over four years; energy use fell 63%, well past the 40% promised, saving $7 million a year on a $57 million programme

Los Angeles's streetlight upgrade significantly surpassed energy saving projections, achieving 63% reduction. This massive project replaced over 140,000 old sodium bulbs with efficient LEDs. The city also experienced reduced maintenance needs due to the longer lifespan of LED fixtures. Financial savings from energy and maintenance paid for the project within seven years. Environmental gains included substantial cuts in carbon emissions, equivalent to removing thousands of cars annually.