Abstract: A light-emitting device includes multiple light-emitting diode units sequentially connected and coupled to a first power source, a switching circuit connected to the light-emitting diode units, a second power source, and a control module. Power provided by the first power source is larger than power provided by the second power source. The second power source is connected to the light-emitting diode units through the switching circuit, which is controlled by the control module to facilitate the delivery of the power of the first power source or the second power source to the light-emitting diode units. When the first power source serves to deliver the power thereof to the light-emitting diode units, the light-emitting diode units may be in a serial conduction. When the second power source serves to deliver the power thereof to the light-emitting diode units, the light-emitting diode units may be in a parallel conduction.

Abstract: An electronic device includes a circuit board, a plurality of electronic components, a heat dissipation structure and a casing. The electronic components are disposed on the circuit board. The heat dissipation structure includes a first electrically insulating and thermally conductive layer and a metal layer. The first electrically insulating and thermally conductive layer covers the circuit board and/or the electronic components. The thermal conductivity coefficient of the first electrically insulating and thermally conductive layer is greater than 0.5 W/m.k. The metal layer is combined and thermal contacted with the first electrically insulating and thermally conductive layer. The casing has an accommodating space. The circuit board, the electronic components and the heat dissipation structure are received in the accommodating space, and the metal layer is disposed between the casing and the first electrically insulating and thermally conductive layer.

Abstract: An LED tube light includes a glass tube, a base, a light emitting unit, and two lateral cover assemblies. The base has a length larger than the length of the glass tube, wherein two opposite end portions of the base are arranged out of a region defined by orthographically projecting from the glass tube to the base. The light emitting unit is fixed on the base and is used for emitting light, passing through the glass tube to illuminate. The two lateral cover assemblies are respectively covered around the two end portions of the glass tube, wherein the two lateral cover assemblies are respectively installed on the two end portions of the base for maintaining the relative position between the cover assemblies and the base.