... longer life span , 3, good groud illuminance Best solar street light ever *severy years professional experience. *3-5 times longer ... without extra lens, Super Bright LED(110-120lum/W), Low Light decay: only 4% after using for 10000 hourscontrollerSRS patent Controller ... functions, such as, Anti-Over-charge, Over-discharge, with Light Sensor & Timer, including the Digital LED Driver to drive the LED ...