Abstract: A control system arranged to provide dimming control of light output of one or more light emitting device (124), the control system comprising: a switch mode regulator (91) arranged to provide an output power signal to the one or more light emitting device (124), and to vary the output power signal; one or more feedback sensors (304) arranged to measure characteristic parameters of the output power signal, the characteristic parameters comprising at least one of: current, voltage and power; and a controller arranged to: when a characteristic parameter of the output power signal is above a threshold (210), vary the output power signal in a closed control loop, based on feedback from the one or more feedback sensors (304); and when the characteristic parameter of the output power signal is below the threshold (210), vary the output power signal in an open control loop.

Abstract: A control system arranged to provide dimming control of light output of one or more light emitting device (124), the control system comprising: a switch mode regulator (91) arranged to provide an output power signal to the one or more light emitting device (124), and to vary the output power signal; one or more feedback sensors (304) arranged to measure characteristic parameters of the output power signal, the characteristic parameters comprising at least one of: current, voltage and power; and a controller arranged to: when a characteristic parameter of the output power signal is above a threshold (210), vary the output power signal in a closed control loop, based on feedback from the one or more feedback sensors (304); and when the characteristic parameter of the output power signal is below the threshold (210), vary the output power signal in an open control loop.

Abstract: A power control system for an illumination system has a power source to supply any one of a range of AC or DC voltages, a power conversion stage, one or more light emitting device(s) for illumination and/or wireless communication, a controller controlling an output stage to receive and send information to regulate the power and/or current to the light emitting device(s), and a programmable voltage clamping or linear regulator arrangement contained within the output stage that can be controlled to increase a dynamic dimming ratio of current and/or power through the light emitting device(s) and to enable power or current modulation for wireless optical communication of light emitting device(s). The power control system enables current and power to be provided to one or more attached light emitting device(s) with a vastly extended dynamic dimming range such that different light emitting devices can be powered using the same driver output stage(s).

Abstract: A downlighting illumination system (100) is provided having a high light output ratio with an extended apparent source size producing a near uniform illuminance, correlated colour temperature and colour rendering index distribution across an illuminated area. The system (100) includes a power source (61), an electronic driving system (60), a light emitting source (65), a reflector (67) arranged to receive light from the light emitting source (65) and to reflect light through an output aperture in a manner that virtually extends the apparent size of the light emitting source (65) to illuminate the output aperture.

Abstract: A hybrid power control system for providing dynamic power control to illumination systems in which a power source can supply any one of a range of AC or DC voltages. One or more switch mode power supplies incorporating one or more linear and switch mode regulator circuits combined to dynamically control current, voltage and power to the illumination system. A microprocessor or other integrated circuit device to receive and send control information in order to regulate the power to a light emitting device One or more output drive stage(s) capable of delivering a wide dynamic current range, channel bonding and protection circuitry compatible with standard or common anode illumination systems.

Abstract: A power control system for an illumination system has a power source to supply any one of a range of AC or DC voltages, a power conversion stage, one or more light emitting device(s) for illumination and/or wireless communication, a controller controlling an output stage to receive and send information to regulate the power and/or current to the light emitting device(s), and a programmable voltage clamping or linear regulator arrangement contained within the output stage that can be controlled to increase a dynamic dimming ratio of current and/or power through the light emitting device(s) and to enable power or current modulation for wireless optical communication of light emitting device(s). The power control system enables current and power to be provided to one or more attached light emitting device(s) with a vastly extended dynamic dimming range such that different light emitting devices can be powered using the same driver output stage(s).

Abstract: A hybrid power control system for providing dynamic power control to illumination systems in which a power source can supply any one of a range of AC or DC voltages. One or more switch mode power supplies incorporating one or more linear and switch mode regulator circuits combined to dynamically control current, voltage and power to the illumination system. A microprocessor or other integrated circuit device to receive and send control information in order to regulate the power to a light emitting device One or more output drive stage(s) capable of delivering a wide dynamic current range, channel bonding and protection circuitry compatible with standard or common anode illumination systems.

Abstract: A lighting fixture (1010) has a fluorescent tube (1012) and a plurality of emitters (1022-1032). A color sensor (1016) detects light that has been totally internally reflected within a diffuser (1014) and provides a color feedback signal to a feedback control circuit (1020) to control the light output from the fixture (1012).

Abstract: A system for controlling solid state lighting comprises a source (1) to supply any one of a range of AC or DC voltages to a plurality of light strings (3, 4, 5). The source (1) includes a power factor correction circuit 14 for controlling the power factor to the system and a separate transformer (15, 16, 17) for each light string (3, 4, 5). The current that can pass through each LED string (3, 4 and 5) is independently limited by each corresponding LED driver circuit (6, 19 and 20). The current through each LED string (3, 4 and 5) can be modified according to a feedback monitor system (18, 21 and 22) that measures parameters such as LED characteristics, forward current, temperature, and LED output intensity/colour.

Abstract: A lighting fixture (1010) has a fluorescent tube (1012) and a plurality of emitters (1022-1032). A colour sensor (1016) detects light that has been totally internally reflected within a diffuser (1014) and provides a colour feedback signal to a feedback control circuit (1020) to control the light output from the fixture (1012).

Abstract: A light emitting diode illumination control system is disclosed for driving a current circuit for energizing one or more LED light sources. The system comprises a control system including a microprocessor arranged to control a pulse amplitude modulated (PAM) voltage controlled current circuit, and may employ a monitor for monitoring at least one ambient condition and a microprocessor operable to control the current circuit in response to the monitored condition.