A lighting device (30) having a housing (12) which includes a lamp means, a battery housing to receive at least one battery and a switch means to open and close a circuit between said lamp means and terminals of said at least one battery when located in said housing. Said lighting device includes a lanyard (110, 112) attached to said housing (12) characterised by said lanyard having a proximal end attached to said housing (12) and a distal end, whereby said distal end or a portion of said lanyard (110, 112) is adapted to be releasably attached to said housing (12).

A lighting device (1; 101; 201; 301) for lighting objects is described, which comprises a printed circuit board (2) on which at least one LED light source (2) is mounted coupled to a primary optical assembly (3) for transmission and amplification of the light emitted by the light source, a containing body (5) enclosing the circuit board (2), and a secondary optical assembly (6) mounted on the containing body (5) at a suitable distance from the primary optical assembly (3) to generate at least one light beam leaving said lighting device.

A lamp (10) includes an optics module (12) and an electronics module (14, 60, 70). The optics module (10) includes a plurality of LEDs (76) arranged on a printed circuit board (18) and having a plurality of input leads, and a heat sink (22) having a conduit (40) for the input leads. The plurality of LEDs (16) thermally communicate with the heat sink (22). The electronics module (14, 60, 70) is adapted to power the plurality of LEDs (16) through the input leads. The electronics module (14, 60, 70) has a first end (52) adapted to rigidly connect with the heat sink (22), and a selected electrical connector (50, 62, 72) arranged on a second end for receiving electrical power. The electronics module (14, 60, 70) further houses circuitry (80) arranged therewithin for adapting the received electrical power (82) to drive the LEDs (16).

A circuit for a discharge lamp includes a first sub-circuit for connecting to mains voltage of a predetermined frequency for rectifying the mains voltage; and a second sub-circuit connected to the first sub-circuit for providing an alternating current, such as a square-wave current, required for the lamp. A control circuit is connected to the first and the second sub-circuit. The control circuit controls the frequency of the alternating current subject to a varying component of the mains voltage rectified by the first sub-circuit.

An LED lighting device is provided which is capable of being connected to a network and being controlled by a host computer also connected to the network. The lighting device has several lifespan expanding features such as including several extra LEDs such that as the LEDs of the lighting device degrade over time more LEDs can be turned on thus allowing a constant luminosity to be maintained.

The light has a light body (5) and a bearer arm (2) that carries the body on one end and is connected to a base part (8) at the other. The bearer arm has a continuous series of elements (3) joined together by joining linkages (4) and at least one flexible element extending over the linkage at the base and essentially arranged within the element to absorb at least some of the torque acting on the joining linkage at the base when the light is used.

The first lamp (3) is a gas discharge lamp, the second (4) is incandescent. Their end caps are held and connected in sockets (1, 15), forming a unit (16) which can be turned about an axis. The unit is released by unlocking, allowing it to be rotated by a pre-tensioned torsion spring (8). The spring is connected between the pivoting unit and a fixed part of the lamp body.

An electrical heating element comprising a resistive element consisting of granular boron carbide packed in a quartz tube embedded in a piece of copper. A first power lead is electrically connected to the boron carbide at one end of the quartz tube. This first power lead passes through and is electrically insulated from the piece of copper. The second power lead is electrically connected to the boron carbide at the other end of the quartz tube, either directly or via the piece of copper. In use, connection of the first and second leads to an electrical power source causes the resistive element to generate heat in a very fast manner and to trandmit this heat to the piece of copper.