Abstract: The disclosure provides a lamp device. The lamp device includes a metal cover, a heat conductive plate, a light board, and at least one first heat pipe. The heat conductive plate is disposed on the metal cover. The light board is located at a side of the heat conductive plate. One end of the at least one first heat pipe is connected to the heat conductive plate, and another end of the at least first heat pipe is connected to the light board. The light board and the heat conductive plate are spaced apart from each other by a distance.

Abstract: A phase-change heat dissipating device includes a heat absorbing body, a heat dissipation body and two tubes. The heat absorbing body is filled with a working fluid. A light source and the heat dissipation body are disposed on a same side of the heat absorbing body. The heat dissipation body has a light transmitting space which is corresponding to the light source. The tubes connect the heat absorbing body and the heat dissipation body. When the heat dissipation body is located higher than the heat absorbing body and the working fluid absorbs the heat energy generated from the light source, the working fluid is evaporated from liquid phase to gas phase and flows into the heat dissipation body through the tubes. The working fluid locating in the heat dissipation body is condensed from gas phase into liquid phase and flows to the heat absorbing body through the tubes.

Abstract: An address-free driving device and lighting fixture system are disclosed. The device is applied in controlling a lighting device, and includes a serial interface, a signal converter, a signal processor and a lighting driving unit. The signal converter converts an inputted signal from the serial interface into a digital signal. The signal processor then extracts a controlling data corresponding to the address-free driving device from the digital signal, and determines whether or not the inputted signal from the serial interface can be outputted to another address-free driving device. The lighting driving unit drives the lighting device to illuminate light based on the controlling data. Accordingly, when the lighting devices are electrically and serially connected, the address-free driving device then controls the lighting devices based on the order of series connection.