Abstract: This invention relates to phototherapy lights, in particular for a combination of Bright Light Therapy and Dawn Simulation. A phototherapy light source having two operational modes, a first dawn simulator mode; and a second, bright light therapy mode; the light comprising a controller coupled to a light source; and wherein, in said first mode said light source is controlled to provide variable illumination with a minimum light intensity of less than 1 lux at 50 centimeters, and in said second mode said light source is controlled to provide illumination with a light intensity of at least 1000 lux at 50 centimeters.

Abstract: An apparatus for controlling two light sources using an input voltage from a mains light dimmer, the light sources comprising a first light source configured to emit light having a second colour temperature, wherein the second colour temperature is higher than the first colour temperature, the apparatus comprising an input connection for receiving the input voltage from the mains light dimmer, a sensor for sensing a value voltage of the input voltage, driving means for driving the light sources, and a controller for controlling the driving means responsive to said sensing.

Abstract: The present invention relates to improvements in lighting systems, in particular lighting systems having variable colour temperature. We describe an apparatus for controlling two light sources using an input voltage from a mains light dimmer, the light sources comprising a first light source configured to emit light having a second colour temperature, wherein the second colour temperature is higher than the first colour temperature, the apparatus comprising an input connection for receiving the input voltage from the mains light dimmer, a sensor for sensing a value voltage of the input voltage, driving means for driving the light sources, and a controller for controlling the driving means responsive to said sensing.

Abstract: This invention relates to phototherapy lights, in particular for a combination of Bright Light Therapy and Dawn Simulation. A phototherapy light source having two operational modes, a first dawn simulator mode; and a second, bright light therapy mode; the light comprising a controller coupled to a light source; and wherein, in said first mode said light source is controlled to provide variable illumination with a minimum light intensity of less than 1 lux at 50 centimetres, and in said second mode said light source is controlled to provide illumination with a light intensity of at least 1000 lux at 50 centimetres.