A light source module of a projector includes a light source having a lamp axis, a fan for providing a cooling airflow, and a flow guide device disposed between the light source and the fan and for guiding the cooling airflow. The flow guide device includes a first air channel connected between a side of the light source and an air outlet of the fan, a second air channel connected between another side of the light source and the air outlet of the fan, and a first airflow control assembly disposed in the first air channel and for controlling the first air channel either in communication or non-communication states via gravity. The first airflow control assembly has a first control rotating shaft inclined relative to the lamp axis and a first included angle between the first control rotating shaft and the lamp axis is less than 90 degrees.

A highly efficient LED lighting fixture includes a plurality of LEDs and a power converter and control circuit. The power converter circuit is a non-isolated power converter circuit. A heat sink is thermally coupled to a circuit board that carries the power converter, and an AC powered fan directs air over the heat sink to remove heat from the circuit board. The LED lighting fixture has an efficacy of at least 70 lm/w.

A highly efficient LED lighting fixture includes a plurality of LEDs and a power converter and control circuit. The power converter circuit is a non-isolated power converter circuit. A heat sink is thermally coupled to a circuit board that carries the power converter, and an AC powered fan directs air over the heat sink to remove heat from the circuit board. The LED lighting fixture has an efficacy of at least 70 lm/w.

In a first aspect of the present inventive subject matter, a light-emitting device includes a magnetic circuit including a magnetic gap; a movable member including a coil that is electrically connectable to an alternating current power source and arranged in the magnetic gap of the magnetic circuit; and a light source including a light-emitting diode and arranged above the movable member, and the movable member is able to be activated with a voltage falling in a range of one to five percent of an entire voltage range that is applicable to the light-emitting device.

In a first aspect of the present inventive subject matter, a light-emitting device includes a magnetic circuit including a magnetic gap; a movable member including a coil that is electrically connectable to an alternating current power source and arranged in the magnetic gap of the magnetic circuit; and a light source including a light-emitting diode and arranged above the movable member, and the movable member is able to be activated with a voltage falling in a range of one to five percent of an entire voltage range that is applicable to the light-emitting device.

A cooling system for a light emitting diode assembly includes a heat exchanger configured to exchange heat from a fluid to ambient air, an enclosure configured to house the LED assembly, and a pump configured to circulate the fluid through the enclosure, through the LED assembly, or both, and through the heat exchanger. The fluid is configured to absorb heat at the LED assembly and generated by the LED assembly, and the heat exchanger is configured to cool the fluid and remove the heat absorbed by the fluid at the LED assembly.

A cooling system for a light emitting diode assembly includes a heat exchanger configured to exchange heat from a fluid to ambient air, an enclosure configured to house the LED assembly, and a pump configured to circulate the fluid through the enclosure, through the LED assembly, or both, and through the heat exchanger. The fluid is configured to absorb heat at the LED assembly and generated by the LED assembly, and the heat exchanger is configured to cool the fluid and remove the heat absorbed by the fluid at the LED assembly.

The present invention is related to an UV LED curing apparatus, and more particularly, to an UV LED curing apparatus with improved housing and switch controller. The light reflective inner casing is preferably provided as an effective UV light reflector and as a supporting substrate of the UV LED light source while being capable of transmitting heat from the UV LED light source away for further heat dissipation to the ambient by the outer casing. The outer casing is detachably attached to the inner casing and allows a greater user interaction for decorative and entertainment purposes while also being a protective and heat dissipation means.

The present invention is related to an UV LED curing apparatus, and more particularly, to an UV LED curing apparatus with improved housing and switch controller. The light reflective inner casing is preferably provided as an effective UV light reflector and as a supporting substrate of the UV LED light source while being capable of transmitting heat from the UV LED light source away for further heat dissipation to the ambient by the outer casing. The outer casing is detachably attached to the inner casing and allows a greater user interaction for decorative and entertainment purposes while also being a protective and heat dissipation means.

A ceiling element including a base adapted to be mounted in a ceiling of a room, thereby defining a room space under the base and a ceiling space above the base, is provided. The ceiling element includes a battery container adapted to receive a battery and arranged at the base such that it is located in the ceiling space when the ceiling element is mounted in the ceiling. The ceiling element further includes a conduit arranged to convey air between the room space and the ceiling space and/or the battery space when a temperature of the room space is different from a temperature of the ceiling space and/or a temperature of the battery container. A method of thermal management of a battery received in a battery container located in a ceiling space is also provided.