Abstract: A sensing device comprises a microwave sensor (1) configured to emit microwave radiation and to receive microwave radiation reflected by a moving body in the field of detection of the microwave sensor and a wireless data transmitter (4) configured to transmit data to a remote receiver. A main power supply provides electrical power at a first voltage to the sensing device. A first regulator 6 provided between the main power supply and the microwave sensor (1) provides a sensor power supply to the microwave sensor (1) at a voltage below the voltage of the main power supply. The wireless data transmitter (4) is powered from the main power supply via a transmitter power supply connection arranged in parallel with the first regulator (6). The microwave sensor (1) is provided on a first circuit board and the wireless data transmitter (4) is provided on a second circuit board, with the second circuit board overlying the first circuit board and spaced therefrom.

Abstract: Apparatus for controlling an electrical load, in particular for the environmental control of a room, comprises an occupancy sensor 5 comprising a thermopile array. The occupancy sensor is responsive to the presence of a person within a detection field 13 of the occupancy sensor 5. The apparatus further comprises a movement sensor 6 responsive to the movement of a person within a detection field of the movement sensor and a controller arranged to receive detection signals from the occupancy sensor 5 and the movement sensor 6 and to generate a control signal for the electrical load in response to the received detection signals. The controller is configured to generate a first control signal in response to detection of a person by the movement sensor 6 and to modify the first control signal to a second control signal in response to detection of a person by the occupancy sensor 5.

Abstract: Embodiments of the present invention relate to a detector (100) suitable for attaching to a light fitting. The detector comprises a passive infra red sensor (102) and a clip (128) suitable for suspending the detector from a light fitting.

Abstract: A method for controlling a light, comprising: providing a first sensor device (11) comprising a first transmitter and a first occupancy sensor; providing a lighting controller (1) comprising a receiver and a second sensor; and transmitting an occupancy signal from the first transmitter to the receiver. The occupancy signal comprises a repeated cycle of transmission phases and silent phases, such that during a transmission phase the transmitter transmits and during a silent phase the transmitter does not transmit. The method further comprises activating the light when the second sensor is triggered; and deactivating the light after a period of time, the length of the period being determined at least in part by the occupancy signal transmitted by the first transmitter.

Abstract: A method for controlling a light, comprising: providing a first sensor device (11) comprising a first transmitter and a first occupancy sensor; providing a lighting controller (1) comprising a receiver and a second sensor; and transmitting an occupancy signal from the first transmitter to the receiver. The occupancy signal comprises a repeated cycle of transmission phases and silent phases, such that during a transmission phase the transmitter transmits and during a silent phase the transmitter does not transmit. The method further comprises activating the light when the second sensor is triggered; and deactivating the light after a period of time, the length of the period being determined at least in part by the occupancy signal transmitted by the first transmitter.

Abstract: A lighting control system (1) comprising: a plurality of lights (3); a control unit (2); and a power usage monitor (4) suitable for monitoring the power used by the lights (3). In use, when the user varies the lighting level of a first light, the control unit is configured to vary the lighting level of at least a second light, dependent upon an evaluated total power usage level.

Abstract: Embodiments of the present invention relate to a detector (100) suitable for attaching to a light fitting. The detector comprises a passive infra red sensor (102) and a clip (128) suitable for suspending the detector from a light fitting.

Abstract: A battery-powered light level sensing device comprises a light level sensor 1 and a wireless transmitter 3 in data communication with the light level sensor and configured to transmit light level information from the light level sensor 1 to a lighting controller for a room. The sensing device also includes attachment means adapted to attach the sensing device to the glass of a window defining a boundary of the room with the light level sensor positioned to sense the ambient light level outside the room.

Abstract: A device (1) for controlling the electrical power supplied to a light source (2). The device comprises at least one dimmer (5) which is suitable for receiving an input in the form of an alternating current and producing an output in the form of a current of the same or lower power. The device also comprises a frequency sensitive apparatus 6 arranged so as to monitor the frequency of the input. The dimmer is arranged to vary the power of the output in response to the frequency of the input as detected by the frequency sensitive apparatus.

Abstract: A device for replacing conventional wall mounted light switches in situ comprises a dimmer (1) and an occupancy sensor (4). These are arranged such that the electrical power of at least one output (2) can be varied manually and in response to signals generated by the occupancy sensor.