Apparatus and method for filming a scene using a plurality of strobable lighting setups in rapid sequence to concurrently record a plurality of motion picture clips of the scene, one motion picture clip for each strobable lighting setup. The apparatus includes a plurality of strobable light sources that are coordinated to form the plurality of lighting setups, a controller to actuate the strobable lighting setups at a constant rate in a sequence that repeats multiple times during each macro frame, and a camera to capture a burst sequence of images within each macro frame. The burst sequence of images shows the scene illuminated by each one of the plurality of lighting setups in sequence during each macro frame. Since the constant rate is above the flicker threshold, people on set viewing the scene illuminated by the repeating sequence of strobable lighting setups perceive apparently continuous (non-flickering) illumination of the scene.

A supply circuit adapted to provide a continuous power supply for a string of serially connected light emitting elements driven with a current source, said supply circuit including: a voltage supply capacitor connected to said string and being adapted to provide a supply voltage for a driving control unit configured to control the light emitting elements of said string; and a capacitor bypass switch connected in parallel with said voltage supply capacitor and being controlled by a local control circuit of said driving control unit, wherein said capacitor bypass switch is switched off by said local control circuit to charge said voltage supply capacitor with a charging current to maintain a continuous power supply without disturbing the current to said string of light emitting elements.

An embodiment comprises: a voltage generation unit for providing a direct current signal for driving a light emitting unit; a sensing resistor; and a dimming unit which is connected between the light emitting unit and the sensing resistor and controls a current flowing in the sensing resistor and the light emitting unit, wherein the dimming unit adjusts the level of the direct current signal on the basis of a first sensing voltage as a result of sensing the voltage of a first node where a switch is connected to the light emitting unit, and a second sensing voltage as a result of sensing the voltage of a second node where the switch is connected to the sensing resistor.

A power converter comprising an inverter for receiving a supply power and providing an alternating output. An output rectifier receives the alternating output and provides a rectified output to a load. An output winding receives the rectified output, and a sensing winding is inductively coupled to the output winding and provides a sensing output. A controller receives the sensing output and provides a control signal to the inverter for controlling the alternating output. A related method of converting power is also provided.

A lighting device, such as a light-emitting diode (LED) light source, may operate in an interim operable state to avoid and/or prevent undesirable characteristics in the light emitted by the lighting device (e.g., strobing and/or flickering of a brightness of the light and/or shifting or change of a color of the light). When operating in a normal state, the control circuit may determine if a measured value of a first operational characteristic (e.g., a forward voltage of an emitter of the lighting device) is outside of a range and operate in the interim operable state if the measured value of the first operational characteristic is outside of the range. When operating in the interim operable state, the control circuit may adjust a drive current for the emitter in response to a measured value of a second operational characteristic (e.g., a forward voltage of a detector of the lighting device).

The invention describes an LED lighting system (1) comprising a wireless communication arrangement (11, 12) for wireless transfer of signals (D.sub.10.sub._.sub.11, D.sub.11.sub._.sub.12, D.sub.4.sub._.sub.12, D.sub.5.sub._.sub.12) between devices (10, 11, 12, 4, 5) of the LED lighting system (1); at least one LED lamp (10) connectable to a mains power supply (2), which LED lamp (10) comprises a driver arrangement (100) with a control unit (102) for controlling the LED lamp (10) according to a received signal (D.sub.10.sub._.sub.11); a phase-cut detector (103A, 103B, 103C) realized to detect a phase-cut input (V.sub.cut) to the LED lamp (10); and a protection circuit (106) realized to prevent operation of the LED lamp (10) with the phase-cut input (V.sub.cut) if the phase-cut angle of the phase-cut input (V.sub.cut) exceeds a critical threshold, wherein said protection circuit (106) is adapted to prevent an exposure of the LED lamp to the phase-cut input. The invention further describes an LED lamp (10) comprising a driver arrangement (100); and a method of controlling an LED lighting system (1).

A method for a driver device of an automotive lighting device that includes at least two inputs for receiving one electricity supply each, and a power converter circuit for selectively converting the electricity supplied on one of the inputs into a periodic power supply for powering said lighting device. The method allows for switching between inputs of the driver device while reducing the power supply shortage which generally arises at the time of switching inputs. This allows for providing generally flicker-free luminosity while using a single converter circuit.

A Light Emitting Diode (LED) light includes a bridge rectifier configured to be powered by an alternating current power source and to produce a rectified output. Control circuitry couples to the bridge rectifier and is configured to produce a shunt signal when the rectified output is less than a threshold voltage. A series connected Light Emitting Diode (LED) string includes a first group of LEDs and a second group of LEDs. A switch couples to a first side of the second group of LEDs and is controlled by the shunt signal to deactivate the second group of LEDs. The control circuitry may include a ratio metric series resistor string configured to sense a proportion of the rectified output and an inverter configured to generate the shunt signal based on the proportion of the rectified output.

An anti-flicker and anti-glow switchable load apparatus to be installed in the light socket of a commonly powered electronic switching device, such as a motion activated light switch. An energy efficient light bulb or lamp, such as a cathode fluorescent lamp or light emitting diode is then screwed into the apparatus. A first embodiment of the present invention includes a switchable light source, a switchable load, a controller, and a voltage sensor. When the present invention in the first embodiment detects a higher voltage, thus indicating the lamp has been switched from the “off” state to the on state, the switchable load is disconnected, and the current is re-routed to pass through the energy efficient lamp.

A method for a driver device of an automotive lighting device that includes at least two inputs for receiving one electricity supply each, and a power converter circuit for selectively converting the electricity supplied on one of the inputs into a periodic power supply for powering said lighting device. The method allows for switching between inputs of the driver device while reducing the power supply shortage which generally arises at the time of switching inputs. This allows for providing generally flicker-free luminosity while using a single converter circuit.