Most solar street lights designed for residential streets, parking lots, or small commercial areas operate within a range of 40W to 120W. This wattage is sufficient to provide adequate brightness (measured in lumens) while maintaining energy efficiency. . How many watts can a solar street light reach? 1. Solar street lights can reach wattage levels typically ranging between 30 and 200 watts, influenced by factors such as design and application. For quiet residential paths, 10 to 20 watts might be enough. The beauty is, unlike traditional street lights. . To choose the best solar street light, consider lumens per watt efficiency, battery capacity, solar panel quality, and installation environment. High-lumen LED chips, monocrystalline solar panels, MPPT charge controllers, and durable materials ensure long-lasting performance.