Eurodiya Solar Light Bulb harness the solar energy and lights the home and outdoors. The solar energy is used as an alternative energy to kerosene and electricity saving mankind from the burden of fossil fuels. The built in AA NiMH rechargeable battery gets charged in the direct sunlight for maximum time at an optimal angle to the sun. Once dark enough, push switch to on position. The bulb will not turn on until it is dark enough so as to save battery. Euro Diya Solar Light Bulb