Abstract: A system for controlling solid state lighting including a source to supply any one of a range of AC or DC voltages to a plurality of light strings. The source includes a power factor correction circuit 14 for controlling the power factor to the system and a separate transformer for each light string. The current can pass through each LED string is independently limited by each corresponding LED driver circuit. The current through each LED string can be modified according to a feedback monitor system that measures parameters such as LED characteristics, forward current, temperature, and LED output intensity/color. Each LED string has an independent sensor that monitors the voltage across each switching device in the corresponding LED driver circuits and utilizes a control unit to control the voltages supplied by each corresponding transformer through control signals in response to the monitored switching device voltages.

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).