An embodiment of the disclosure provides a light source apparatus including a light-emitting module and a control unit. The light-emitting module is configured to provide a light. The control unit is configured to change proportion of a first sub-light and a second sub-light to form the light so that a circadian action factor (CAF) and a correlated color temperature (CCT) of the light varies along a CAF vs. CCT locus of the light different from a CAF vs. CCT locus of sunlight. A CAF vs. CCT coordinate of one of the first sub-light and the second sub-light is below the CAF vs. CCT locus of sunlight, and a CAF vs. CCT coordinate of the other one of the first sub-light and the second sub-light is above the CAF vs. CCT locus of sunlight. A display apparatus is also provided.

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.

One embodiment of the invention relates to a system for operating a plurality of streetlights in response to motion from a vehicle. The system includes a sensor associated with at least one of the streetlights and configured to detect the presence of a moving vehicle and to provide a signal representative of the moving vehicle. The system further includes a radio frequency transceiver associated with each of the streetlights. The system yet further includes processing electronics configured to receive the signal representative of the moving vehicle from the sensor and to cause the radio frequency transceiver to transmit a command to one or more of the plurality of the streetlights to change lighting states along a pathway for the vehicle.

One embodiment of the invention relates to a system for operating a plurality of streetlights in response to motion from a vehicle. The system includes a sensor associated with at least one of the streetlights and configured to detect the presence of a moving vehicle and to provide a signal representative of the moving vehicle. The system further includes a radio frequency transceiver associated with each of the streetlights. The system yet further includes processing electronics configured to receive the signal representative of the moving vehicle from the sensor and to cause the radio frequency transceiver to transmit a command to one or more of the plurality of the streetlights to change lighting states along a pathway for the vehicle.

A lighting system includes a plurality of lighting devices installed in a predetermined space and connected to one another to communicate with one another using at least one of a first communication method and a second communication method, and a mobile device directly connected to at least one of the plurality of lighting devices to communicate therewith according to the first communication method. The first communication method and the second communication method are different. Each of the plurality of lighting devices includes a communication module configured to support the first communication method and the second communication method, and a driver configured to drive a light source in response to a control command received by the communication module.

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.

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.

The present disclosure provides an intelligent lighting control system include a pre-mount chassis system. The methods include attaching a chassis to an electrical wall box, the chassis comprising at least one hook extending in an upward direction and at least one opening, the at least one hook positioned along a peripheral portion of the at least one opening. The methods include hanging a base module from the at least one hook in the chassis.