Abstract: A multimedia playback system includes a multimedia device, for generating a control interface according to a request and performing an operation according to a control signal; a server, coupled to the multimedia device for storing the control interface generated by the multimedia device and generating the control signal according to an instruction signal; and a hand-held device, coupled to the server for accessing the control interface stored in the server and generating the instruction signal according to the control interface and an input signal.

Abstract: A light emitting diode (LED) lamp includes a base and a pivotally turnable lamp holder connected to the base. The lamp holder is internally provided with at least one LED and a heat sink. The heat sink has a plurality of longitudinally spaced rows of upright radiating fins provided thereon with the radiating fins in each row transversely spaced from one another and a long slot having a predetermined length formed between any two adjacent radiating fins in each row. The heat sink is also provided with at least one round mounting hole for the LED to mount therein. The heat sink and the radiating fins and long slots provided thereon help in dissipating heat produced by the LED during the operation thereof to thereby enable prolonged usable life of the LED lamp.

Abstract: A light source lens includes a circular lens mount defining a shallow concave recess with a square opening, and a lens engaged with the lens mount to locate above the concave recess to receive light projected thereto via the square opening. The lens includes a first spherical portion and a second spherical portion protruded from a top center of the first spherical portion, and is densely provided at a bottom with a plurality of irregular grooves to form an uneven bottom surface. The first and the second spherical portion diffuses and concentrates, respectively, a light source passed through the lens, and the uneven bottom surface of the lens causes the light passed therethrough to scatter at more different angles, so that any halo is eliminated and a softer lighting effect is created.

Abstract: A light-emitting diode (LED) is mounted on a heat radiating unit therefor. The LED includes a metal carrier having two through holes, and a light-emitting chip packaged on the metal carrier and having a positive and a negative pin fixed to and insulated from the through holes by sintered glass. The heat radiating unit includes a seat and a hold-down plate closed onto a top of the seat. The seat is formed with a plurality of cavities and provided at an underside with a plurality of radiating fins; the hold-down plate is formed with a plurality of openings corresponding to the cavities on the seat. The LED is mounted in the cavity to expose to external space via the openings on the hold-down plate. Heat produced by the LED during working is transferred via the metal carrier to the heat radiating unit and radiated quickly.