A dual-control dimming system is disclosed. The dual-control dimming system is configured to automatically change control of an LED between two control loops as an LED output is adjusted over a dimmable range. A first control loop may take control of the LED output in a first portion of the dimmable range, while the second loop may take control of the LED output in a second portion of the dimmable range. In this way, the LED may be powered efficiently in the first portion, while providing stable (i.e., flicker-free) output in the second portion.

The contemplated system allows users to engage in a recording activity with studio quality light. Because the system is portable and easily deployable, the system can be carried to and quickly set up by the user in any location where the recording will occur. The system includes a lighting instrument that can be installed on the display with the web camera exposed. The lighting instrument includes a light source configuration that can reduce lens flare. The system allows for operation as a dock station when not deployed. The contemplated method allows users to operate the system. The method helps the user achieve the optimal light intensity and angle for the recording area with reduced time and efforts. The method may consider distance, ambient light, location of the subject and other factors in its determination. The method allows users to further adjust the intensity and angle if necessary.

According to a first aspect disclosed herein, there is provided a controller for controlling a first light source to emit light into a pupil of a human user in order to reduce at least one biological effect of light from a second light source on the human user, the controller comprising: a first input for receiving light property data indicating a property of the light from the second light source, said property being of a type which causes a biological effect on the human user; a second input for receiving pupil data indicating a size of the pupil of the human user; an output for sending control commands to the first light source; a processor configured to: determine, using the light property data received via the first input, that the light from the second light source has said property; in response to said determination that the light from the second light source has said property, determine, using said pupil data received via the second input, a current size of the pupil; and on condition that the current size of the pupil is determined to be larger than a minimum size, control the first light source to emit light not having said property into the pupil and thereby reduce the size of the pupil.

A light-emitting device has a stabilizing-current circuit, a current source having a high electron mobility transistor, and a light source electrically connected to the stabilizing-current circuit and the current source.

A control circuit is configured to: change a dispersion state of the electrophoretic particles by controlling voltage across the first transparent electrode and the second transparent electrode to change a range of exit direction of light transmitted through the light transmissive regions and the dispersion medium; apply direct voltage at a first voltage value across the first transparent electrode and the second transparent electrode to change the range of exit direction from a narrow range to a wide range; measure luminance of light transmitted through the light beam direction control panel during application of the voltage at the first voltage value; and increase the voltage value to be applied across the first transparent electrode and the second transparent electrode in a case where the measured luminance of the transmitted light is lower than a target value.

Systems and methods are provided herein for current regulation. An example system controller includes: a first controller terminal configured to receive an input voltage, the first controller terminal being further configured to allow a first current flowing into the system controller based at least in part on the input voltage in response to one or more switches being closed; a second controller terminal configured to allow the first current to flow out of the system controller through the second controller terminal in response to the one or more switches being closed; a fourth controller terminal coupled to the third controller terminal through a first capacitor, the first capacitor not being any part of the system controller; and an error amplifier configured to generate a compensation signal based at least in part on the current sensing signal, the error amplifier including a second capacitor.

A method of configuring an LED light with a tunable diffused light color temperature is disclosed. The method comprises using a light-emitting unit configured with a first LED load emitting light with a low color temperature and a second LED load emitting light with a high color temperature electrically connected in parallel, using a light diffuser to cover the first LED load and the second LED load to create a diffused light with a diffused light color temperature, using two semiconductor switching devices working in conjunction with a controller to respectively control a first electric power delivered to the first LED load and a second electric power delivered to the second LED load to operate a color temperature tuning and switching scheme and using a first external control device to output at least one first external control signal to activate a selection of a diffused light color temperature.

A load control system may include control devices for controlling power provided to an electrical load. The control devices may include an input device and a load control device. The load control system may include a hub device. The hub device may include a communication circuit and a control circuit. The communication circuit may be configured to receive a digital message from the control device. The control circuit may be configured to determine, based on content of the digital message, whether the control device has experienced a power removal event. The hub device may send, via the communication circuit, a power removal event indication to the control device of whether the control device has experienced the power removal event.

The invention provides a lighting system (10) for generating a configurable spotlight effect adapted to direct the attention of an individual from an initial location (34) to a defined second location (36). In particular, the invention comprises a presence detector (14) for detecting motion of an individual (22) at a detection location (28) within a detection area, and for detecting in which direction the individual (22) is moving. A configurable light source (12) is controlled by a controller (18) to create a light effect (30, 32) from a first location (34) in front of the individual (22) based on the direction of the individual (22) toward a defined location (36) so as to thereby draw the attention of the user toward said defined location.

Various embodiments include apparatuses and methods enabling a wireless control apparatus for an LED array. In one example, a control apparatus includes a wireless module to receive a signal from a wireless control-device. The wireless signal may include signals related to a desired CCT value and a D.sub.uv value. A control unit is coupled to the wireless module to translate signals received from the wireless module. The control unit is also coupled to the LED array and to an LED driver. The control unit receive powers for the LED array from the LED driver and provides the power to the LED array in a manner based on the translated signals. A dimmer emulator is coupled to the control unit to provide one or more control signals to the LED driver. Other apparatuses and methods are described.