The disclosure relates in general to privacy glass, and more particularly, to a privacy glass system containing a light source, a diffuser, and a control and power circuitry combined in such a fashion as to make the level of visibility through the privacy glass system controllable.

An LED tube lamp comprises an LED module for emitting light; a rectifying circuit for rectifying an input external driving signal to produce a rectified signal; and a ballast interface circuit coupled to the LED module and comprising a detection circuit configured to determine that the external driving signal is a high frequency or high voltage signal when the voltage level of the rectified signal is higher than a predefined first threshold level. The ballast interface circuit causes an open circuit for the LED module when the voltage level of the rectified signal is higher than a predefined second threshold level but lower than the predefined first threshold level. And the ballast interface circuit causes current conduction in the LED module when the voltage level of the rectified signal, as based on an external driving signal from an inductive ballast, is lower than the predefined second threshold level.

An example circuit includes a plurality of light emitters connected in parallel between a first node and a second node. The circuit also includes a plurality of capacitors, with each capacitor corresponding to one of the light emitters, and a plurality of discharge-control switches, with each discharge-control switches corresponding to one of the capacitors. The circuit further includes a pulse-control switch connected to the plurality of light emitters. During a first period, the pulse-control switch restricts current flow, and each of the plurality of capacitors is charged via the first node. During a second period, one or more of the plurality of discharge-control switches allows current flow that discharges one or more corresponding capacitors. During a third period, the pulse-control switch allows current flow that discharges one or more undischarged capacitors of the plurality of capacitors through one or more corresponding light emitters.

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.

A lamp including a body for containing a light engine that includes at least a first and second string of said light emitters. The lamp includes driver electronics including an AC-DC switching power supply section of a circuit including a first potentiometer for adjusting total current to the light engine; and a linear topology LED string current control section of the circuit including an operational amplifier controlled by a second potentiometer to operate a field effect transistor (FET) in the linear portion of the FETs operation range to adjust a percentage of the total current to the first and second string of the light emitters. Adjusting the total current adjusts the photosynthetic photon flux (PPF) of light emitted by the lamp. Adjusting the percentage of the total current to the first and second string of the light emitters adjusts the spectral power distribution of light being emitted by the lamp.

A lighting system includes a plurality of lighting units. Each lighting unit includes a unit control circuit and a lighting element. The unit control circuit is disposed to store at least one lighting scenario. The lighting scenario comprises a succession of settings of intensity and/or color of the lighting element. A system control circuit is disposed to transmit an execute signal to one or more of the lighting units. The unit control circuit is disposed to control, upon reception of the execute signal, the lighting element according to the lighting scenario. The lighting units are connected to a common electrical power supply via two conductors. The execute signal is transmitted from the system control circuit to the lighting units wirelessly or via the two conductors.

A high-voltage linear drive and memory dimming LED lighting device is disclosed. The lighting device includes a high voltage linear constant current circuit, a control IC, a first LED string and a second LED string. The control IC is electrically connected to the high voltage linear constant current circuit, and the control IC is directly driven by receiving high voltage signals. Wherein, the control IC includes a voltage regulator module, a switching module and a memory module. The voltage regulator module is electrically connected to the high voltage linear constant current circuit; the switching module is electrically connected to the voltage regulator module and includes at least two electronic switches; and the memory module is electrically connected to the switching module.

An apparatus, method and system are disclosed for providing AC line power to lighting devices such as light emitting diodes (LEDs). A representative apparatus comprises: a plurality of LEDs coupled in series to form a plurality of segments of LEDs; first and second current regulators; a current sensor; and a controller to monitor a current level through a series LED current path, and to provide for first or second segments of LEDs to be in or out of the series LED current path at different current levels. A voltage regulator is also utilized to provide a voltage during a zero-crossing interval of the AC voltage. In a representative embodiment, first and second segments of LEDs are both in the series LED current path regulated at a lower current level compared to when only the first segment of LEDs is in the series LED current path.

A driving method for driving an LED tube lamp is disclosed. The LED tube lamp includes a lamp tube, two end caps, an LED module, and a power supply module including an electric shock detection circuit. The driving method is capable of detecting whether a human touches the conductive part of the LED tube lamp when one end of the LED tube lamp has been inserted into a lamp socket.

A lighting control console for controlling a lighting system includes at least one digital processor, at least one digital memory, and at least one display device configured to graphically depict graphic elements for users. At least one dual encoder is provided in the control panel, which allows users to enter input values. The dual encoder presents a first shaft rotatably mounted in a housing with a first rotation signal generator and a second shaft mounted in the housing so as to be coaxially rotatable at the dual encoder. Both shafts include actuating elements transmitting adjusting movements onto the shafts. The actuating elements are embodied in a rotary disk and/or of a rotary swivel disposed in the control panel of the lighting control console and configured to be coaxially turned in opposite directions.