Abstract: A power supply device using electromagnetic power generation includes an electric motor, an electromagnet, a winding, a rechargeable unit, and a battery case. The electromagnet is operatively connected to the electric motor so that an activation of the electric motor changes a magnetic field of the electromagnet. The winding is around the electromagnet so that the change of the magnetic field of the electromagnet generates emf in the winding. The rechargeable unit is electrically connected to both the electric motor and the electromagnet so that the emf is stored in the rechargeable unit or supply to an external electric load. The battery case includes an electrical wire electrically connected to the winding.

Abstract: An SMD LED module based light is provided with a plurality of circuit boards; and a plurality of SMDs mounted on the circuit boards and electrically connected thereto. Each SMD includes a seat having a plurality of pins, an LED mounted one the seat, and two metal fastening members, each having two ends electrically connected to the circuit board and at least one of the pins respectively. The seat is spaced apart from the circuit board. The fastening members and the pins can be joined in one of many different configurations.