A heat dissipating light fixture includes one or more elongated rows of LEDs extending a length of a light engine, and forming an array having outer and inner perimeter edges. At least one light engine heat sink is conductively coupled to the light engine and disposed adjacent to the array of LEDs. A driver assembly includes a driver that supplies power to the light engine coupled to the light engine in spaced relation thereto, and a driver heat sink is conductively coupled to the driver and disposed relative to the at least one light engine heat sink so as to prevent conductive heat transfer therebetween.

A heat dissipating light fixture includes one or more elongated rows of LEDs extending a length of a light engine, and forming an array having outer and inner perimeter edges. At least one light engine heat sink is conductively coupled to the light engine and disposed adjacent to the array of LEDs. A driver assembly includes a driver that supplies power to the light engine coupled to the light engine in spaced relation thereto, and a driver heat sink is conductively coupled to the driver and disposed relative to the at least one light engine heat sink so as to prevent conductive heat transfer therebetween.

A light assembly may comprise a heatsink, a plurality of light emitting diodes, and a lens. The heatsink may include a first surface and a second surface opposite the first surface. The second surface may define an airflow path extending from a first end of the heatsink to a second end of the heatsink. The plurality of light emitting diodes may be coupled to the first surface of the heatsink. The lens may be located over the plurality of light emitting diodes and may contact the heatsink.

A light assembly may comprise a heatsink, a plurality of light emitting diodes, and a lens. The heatsink may include a first surface and a second surface opposite the first surface. The second surface may define an airflow path extending from a first end of the heatsink to a second end of the heatsink. The plurality of light emitting diodes may be coupled to the first surface of the heatsink. The lens may be located over the plurality of light emitting diodes and may contact the heatsink.

An assembly, in particular an underwater optical assembly is provided. The assembly comprises a tubular wall mount, a housing and a seal. The wall mount has a cylindrical bore portion and the housing comprises a head and a stem rearwardly protruding from the head along an axis. The head defines a chamber with a window for dry housing an optical device in the chamber and the stem comprising an enclosed channel in fluid communication with the chamber. The stem has a cylindrical stem portion mated to the bore portion. The assembly is configured such that in an assembled configuration the stem portion fits the bore portion in an axial direction, the head is located in front of at least the bore portion of the wall mount, the housing being attached to the wall mount and plugging the wall mount with the seal extending substantially radially between the stem portion and the bore portion sealing the assembly circumferentially watertight. The head has a radial head size and the stem has a radial stem size, wherein the head size is larger than the stem size. The head has one or more circumferential walls forwardly protruding from a substantially radial rear wall, the stem rearwardly protruding from the rear wall. The stem and the one or more circumferential walls each have a thickness in radial direction, defining a rear wall area between a radial outside of the stem and a radial inside of the one or more circumferential walls, wherein the rear wall has, for at least half the radial area a thickness in axial direction that is less than a thickness in radial direction of the circumferential wall, and preferably less than a thickness in radial direction of the stem.

An LED tube lamp with overvoltage protection capability is provided. The LED tube lamp includes a lamp tube, two external connection terminals, a rectifying circuit, a filtering circuit, an LED module, and a protection circuit. The protection circuit is coupled between two input terminals of the LED module and configured to perform overvoltage protection when determining that a voltage level between the two input terminals of the LED module reaches or is higher than a predefined voltage value, wherein the protection circuit includes a diode and the predefined voltage value is in a range of about 40V to about 600V.

An LED tube lamp with overvoltage protection capability is provided. The LED tube lamp includes a lamp tube, two external connection terminals, a rectifying circuit, a filtering circuit, an LED module, and a protection circuit. The protection circuit is coupled between two input terminals of the LED module and configured to perform overvoltage protection when determining that a voltage level between the two input terminals of the LED module reaches or is higher than a predefined voltage value, wherein the protection circuit includes a diode and the predefined voltage value is in a range of about 40V to about 600V.

An angle-adjustable lamp comprises a lamp body, a plurality of heat sinks, a plurality of connecting rods, and a plurality of light-transmitting covers. The plurality of heat sinks are rotatably connected to a side wall of the lamp body respectively through the plurality of connecting rods. The plurality of heat sinks are rotationally symmetrically disposed around a longitudinal center axis of the lamp body. Each of the plurality of light-transmitting covers is disposed on a side of a corresponding one of the plurality of heat sinks facing away from the lamp body. When the plurality of heat sinks are rotated around the plurality of connecting rods, an angle between each of the plurality of light-transmitting covers and the lamp body is correspondingly changed, so that a light exit angle of light transmitted through each of the plurality of light-transmitting covers is correspondingly changed.

An angle-adjustable lamp comprises a lamp body, a plurality of heat sinks, a plurality of connecting rods, and a plurality of light-transmitting covers. The plurality of heat sinks are rotatably connected to a side wall of the lamp body respectively through the plurality of connecting rods. The plurality of heat sinks are rotationally symmetrically disposed around a longitudinal center axis of the lamp body. Each of the plurality of light-transmitting covers is disposed on a side of a corresponding one of the plurality of heat sinks facing away from the lamp body. When the plurality of heat sinks are rotated around the plurality of connecting rods, an angle between each of the plurality of light-transmitting covers and the lamp body is correspondingly changed, so that a light exit angle of light transmitted through each of the plurality of light-transmitting covers is correspondingly changed.

A light emitting device includes a housing; a light source unit; and a cooling unit provided in the housing to discharge heat to an outside of the housing by means of a gas, the heat being generated by the light source unit. The cooling unit includes an introduction portion, a heat exchange portion, and a circulation portion that guides the gas from the introduction portion to the heat exchange portion. The circulation portion includes a first flow path receiving the gas from the introduction portion, and a second flow path receiving the gas from the first flow path, and being connected to the heat exchange portion. The first flow path includes a portion having a flow path area larger than a flow path area of the introduction portion.