Solar street light is a new-age form of lighting solution integrating solar panels, charge controller, LED light and battery.  These lights are available in two varieties, with infrared motion sensors and without, as part of the unit. solar street lights are becoming popular due to their compact design and multiple other advantages. Motion sensors help to adjust the LED brightness intelligently in street lights.  Infrared (IR) and passive infrared (PIR) motion sensors are used for motion sensed detection of emitted/reflected infrared energy.