The working principle is to use solar panels to absorb the light into electrical energy storage battery inside of the control box is installed below the poles from the battery inside the other night when the electricity out for the luminaire to road lighting. If the LED This high light efficiency and low energy consumption lamps, then a street light to start from the foundation to fully Bahrain, almost 2W price, of course, if you are using the energy-saving lamps such relatively cheap lamps, batteries also need not be so good, costs can save thousands of pieces. From the online electrical wiring spare, because the sun is not necessarily a day out, so that energy can not supply every day, draw a line from the mains electricity to streetlights, to form a complementary relationship, known as the "solar complementary street mains