Abstract: The present disclosure describes a boost converter for supplying current to a series connection of light-emitting diodes (LEDs). A duty ratio of the main switch of the converter is configured to be controlled on the basis of a current feedback signal. The current feedback signal is formed as a weighted average of at least two signals including a first signal representing the current through the series connection of LEDs and a second signal representing a current through the main switch.

Abstract: The present invention relates to an illuminator apparatus comprising one or more LEDs and one or more current control components and/or other illuminator components coupled in a thermally conductive manner to a circuit board. The circuit board, in turn, is in a thermally conductive manner integrated into a cooling element which serves as a frame part of the illuminator in order to transfer heat generated by the LEDs and the current control components and/or the other components through the circuit board to the cooling element and therefrom further to other structures of the illuminator and to an ambient environment.

Abstract: A LED tube (41) comprises one or more LED components (34) and a current control unit (33) installed therein. Both ends of the LED tube (41) are provided with a contact pin pair (37, 38, 39, 40) for connecting the LED tube mechanically and electrically to tube holders of a fluorescent tube lighting fixture. The LED tube includes a safety unit (42, 43, S1) arranged to prevent a voltage from passing through the LED tube (41) from its one end to the other end thereof until at both ends of the LED tube, a voltage (U1, U2) fed from the corresponding tube holder of the lighting fixture to the contact pin pair (37, 38, 39, 40) has been detected separately.

Abstract: A LED tube includes a translucent or fluorescent tube of substantially the shape and size of a fluorescence tube, inside which one or more LED components and a current control unit are installed. At both ends of the LED tube, there is a pair of contact pins for connecting the light element mechanically and electrically to the tube holders of the fluorescence tube lighting fixture. The tube lamp has a safety unit arranged to prevent a voltage from transferring through the tube lamp from its one end to the other until a voltage supplied from the corresponding tube holder of the lighting fixture to the pair of contact pins has been separately detected at each end of the tube lamp. Inside the LED tube, there is at least one optical line that is arranged to transfer a control or measurement signal associated with the safety unit from one end of the LED tube to the other without capacitive leakage currents.

Abstract: A LED tube includes a substantially fluorescent-tube-shaped and fluorescent-tube-sized translucent or fluorescent tube having one or more LED components and a current control unit installed therein. Both ends of the LED tube are provided with a pair of contact pins for connecting the LED tube mechanically and electrically to the tube holders of the fluorescent tube lighting fixture. The tube has a safety unit arranged to prevent a voltage from transferring through the tube from its one end to the other until a voltage supplied from the corresponding tube holder of the lighting fixture to the pair of contact pins has been detected at each end of the tube separately. Electric power or switching control of electric power is cross-connected between the ends of the LED tube.

Abstract: A LED tubular lamp comprising a translucent tube (30) of the shape and size of a fluorescence tube with a contact pin pair (37, 38, 39, 40) at both ends thereof for connecting a LED tube mechanically and electrically to the tube holders of the fluorescent tube lighting fixture. LED components (32) and a current control unit (33, 34) are installed inside the LED tube. The LED tubular lamp also comprises a voltage level sensor circuit (42, 43) that is arranged to detect automatically a voltage difference in the contact pin pair at least at one end of the tube and to determine from the voltage difference brightness and/or colour control information for the current control unit (33, 34) of the LED components.

Abstract: A method in conjunction with an emergency light, and an emergency light with equipment comprising one or more LED light sources (52) for producing emergency lighting; a super capacitor (C1) arranged to supply one or more LED light sources (52), a charging apparatus (A) arranged to charge the super capacitor (C1) to a predetermined nominal voltage. The equipment of the emergency light further comprises means for deviating the charging voltage (U) produced by the charging apparatus; and means (C) for detecting the capacitor circuit voltage when the charging voltage is being deviated, the means (C) being arranged to detect a defect in the capacitor circuit in response to the voltage detection.

Abstract: A LED tube includes a translucent or fluorescent tube of substantially the shape and size of a fluorescence tube, inside which one or more LED components and a current control unit are installed. At both ends of the LED tube, there is a pair of contact pins for connecting the light element mechanically and electrically to the tube holders of the fluorescence tube lighting fixture. The tube lamp has a safety unit arranged to prevent a voltage from transferring through the tube lamp from its one end to the other until a voltage supplied from the corresponding tube holder of the lighting fixture to the pair of contact pins has been separately detected at each end of the tube lamp. Inside the LED tube, there is at least one optical line that is arranged to transfer a control or measurement signal associated with the safety unit from one end of the LED tube to the other without capacitive leakage currents.

Abstract: A LED tube includes a substantially fluorescent-tube-shaped and fluorescent-tube-sized translucent or fluorescent tube having one or more LED components and a current control unit installed therein. Both ends of the LED tube are provided with a pair of contact pins for connecting the LED tube mechanically and electrically to the tube holders of the fluorescent tube lighting fixture. The tube has a safety unit arranged to prevent a voltage from transferring through the tube from its one end to the other until a voltage supplied from the corresponding tube holder of the lighting fixture to the pair of contact pins has been detected at each end of the tube separately. Electric power or switching control of electric power is cross-connected between the ends of the LED tube.

Abstract: A LED tube (41) comprises one or more LED components (34) and a current control unit (33) installed therein. Both ends of the LED tube (41) are provided with a contact pin pair (37, 38, 39, 40) for connecting the LED tube mechanically and electrically to tube holders of a fluorescent tube lighting fixture. The LED tube includes a safety unit (42, 43, S1) arranged to prevent a voltage from passing through the LED tube (41) from its one end to the other end thereof until at both ends of the LED tube, a voltage (U1, U2) fed from the corresponding tube holder of the lighting fixture to the contact pin pair (37, 38, 39, 40) has been detected separately.

Abstract: A method in conjunction with an emergency light, and an emergency light with equipment comprising one or more LED light sources (52) for producing emergency lighting; a super capacitor (C1) arranged to supply one or more LED light sources (52), a charging apparatus (A) arranged to charge the super capacitor (C1) to a predetermined nominal voltage. The equipment of the emergency light further comprises means for deviating the charging voltage (U) produced by the charging apparatus; and means (C) for detecting the capacitor circuit voltage when the charging voltage is being deviated, the means (C) being arranged to detect a defect in the capacitor circuit in response to the voltage detection.

Abstract: A method for controlling the color temperature of a lighting fixture, and a lighting fixture, whereby the lighting fixture is implemented using differently colored light emitting diodes. The method comprises steps of generating light by differently colored light emitting diodes (R, G, B) and controlling a current (IdR, IdG, IdB) flowing through the differently colored light emitting diodes in order to provide the lighting fixture with a desired color temperature.

Abstract: The arrangement in connection with a lighting fixture, and a lighting fixture, the arrangement comprising a first light source which is arranged in connection with the lighting fixture structure. The arrangement further comprises one or more second light sources and an optic guide, which comprises a first end, a second end and a guide portion between them; is arranged to transmit light over the guide portion between the first end and the second end; and is arranged in connection with a lighting fixture to provide dimmer lighting compared with the lighting provided with the first source, whereby one or more second light sources is/are arranged in connection with one end or both ends of the optic guide and to function as the light source of the optic guide.

Abstract: An arrangement in connection with a coupling device of a fluorescent lamp, the coupling device comprising a supply transformer, whose secondary is coupled in parallel with a fluorescent tube, the arrangement comprising an indicator circuit configured to indicate the working condition of the fluorescent lamp. The arrangement comprises a signal transformer comprising a first primary coil, to which an alternating voltage signal supply is coupled, a secondary coil, coupled as part of a current path generated by cathodes of the fluorescent lamp and a secondary of the supply transformer and configured to supply alternating current to said current path, the indicator circuit comprising transformer members configured to generate a signal responsive to the alternating current of the current circuit.

Abstract: A lighting fixture, which is arranged to receive two or more elongated light sources positioned one after another in the longitudinal direction of the light sources, the lighting fixture comprising one or more connecting devices, which are arranged to supply energy to the light sources in order to burn them and positioned in a region between the successive light sources in the lighting fixture, and a globe part and a background part, which are arranged to be connected to one another and to substantially surround the light sources and the connecting devices. The lighting fixture further comprises one or more cover plates, which are arranged at the connecting devices between the globe part and the background part of the lighting fixture to substantially cover the connecting devices, and one or more second light sources, which are arranged in connection with the cover plate to provide lighting from the region between the successive elongated light sources.

Abstract: An arrangement in connection with a coupling device of a fluorescent lamp, the coupling device comprising a supply transformer, whose secondary is coupled in parallel with a fluorescent tube, the arrangement comprising an indicator circuit configured to indicate the working condition of the fluorescent lamp. The arrangement comprises a signal transformer comprising a first primary coil, to which an alternating voltage signal supply is coupled, a secondary coil, coupled as part of a current path generated by cathodes of the fluorescent lamp and a secondary of the supply transformer and configured to supply alternating current to said current path, the indicator circuit comprising transformer members configured to generate a signal responsive to the alternating current of the current circuit.

Abstract: The present invention relates to an illuminator apparatus comprising one or more LEDs and one or more current control components and/or other illuminator components coupled in a thermally conductive manner to a circuit board. The circuit board, in turn, is in a thermally conductive manner integrated into a cooling element which serves as a frame part of the illuminator in order to transfer heat generated by the LEDs and the current control components and/or the other components through the circuit board to the cooling element and therefrom further to other structures of the illuminator and to an ambient environment.

Abstract: A method for controlling the color temperature of a lighting fixture, and a lighting fixture, whereby the lighting fixture is implemented using differently colored light emitting diodes. The method comprises steps of generating light by differently colored light emitting diodes (R, G, B) and controlling a current (IdR, IdG, IdB) flowing through the differently colored light emitting diodes in order to provide the lighting fixture with a desired color temperature.

Abstract: A lighting arrangement for public transport vehicles comprising a light source and a reflective surface for reflecting light emitted from the light source to a passenger cabin in a public transport vehicle, whereby the upper part of the passenger cabin in the public transport vehicle substantially comprises an upper structure arranged above the seats of the passenger cabin, the structure comprises one or more handrails in the passenger cabin, and the light source is arranged inside the handrail of the upper structure in the public transport vehicle, and the handrail comprises one or more light-permeable apertures, and the handrail apertures are arranged to direct the light generated from the light source to the upper structure of the passenger cabin in the public transport vehicle, the upper structure being arranged to function as the reflective surface for providing the passenger cabin with indirect lighting.

Abstract: A lighting arrangement comprising a power source, two or more lighting fixtures and switches for switching on power in the lighting fixtures. With the arrangement of the invention, two or more lighting fixtures can be coupled to the same power source. In the invention, the power source is started when one or more voltage supplies are energized. The switches are controlled by means of control wires so that each switch is responsive to energizing the corresponding voltage supply.