The light shell is E27 standard base lamp. Has convenient installation, operation, and maintenance also provide a long life-time usage. The distinction of this model is DC converter, buck range is 10-26 VDC. DC-to-DC converters can convert one DC battery voltage level which may be higher or lower, by storing the input energy temporarily and then releasing that energy to the output at a same voltage. This is a perfect option for energy saving and commercial lighting applications with an aesthetic streamline design. Suitable for home lighting, office, hotel, vessel, solar system, etc.