A vehicle lamp comprises a light source, a drive circuit, a CPU, and a gradual varying controller. The drive circuit supplies a driving current to a light source according to a dimming signal. The CPU generates a turn on or off ordering signal that instructs the light source to be turned on or off according to an instruction from a vehicle and information that indicates a driving situation. The gradual varying controller generates the dimming signal that varies gradually with time in response to the turn on or off ordering signal. The vehicle lamp can be switched between a first mode in which the light source is turned off momentarily and a second mode in which the light source is turned off gradually.

An LED driver circuit controls the currents through a plurality of strings of light-emitting diodes (LEDs), which are connected in series. Each LED string has an associated current regulator. The LED strings are connected between the voltage rail and a reference rail on the output of an AC-to-DC rectifier to receive an unfiltered rectified DC voltage. A first current regulator is active during a first voltage range of the DC voltage to provide a current of a first magnitude to a first LED string only. A second current regulator is active during a second voltage range to provide a current of a second magnitude to the first LED string and to a second LED string. A third current regulator is active during a third voltage range to provide a current of a third magnitude to the first LED string, to the second LED string and to a third LED string.

A lighting apparatus with an image-projecting function that is convenient for a user can be provided. The lighting apparatus includes: an illuminating unit that emits illumination light; and a projection-type image display unit that projects an image. The projection-type image display unit is configured so that a setting menu screen settable about an image displayed by the projection-type image display unit can be displayed.

The invention relates to an integration of a programmable memory device in a luminaire for storing service-related information such as drive parameters, repair history information and the like. The memory device can be read out by the same connectivity used for driving the luminaire, so that the driver can be informed about required operation conditions. The driver can thus learn about the service-related information before starting to drive the luminaire.

The invention relates to an integration of a programmable memory device in a luminaire for storing service-related information such as drive parameters, repair history information and the like. The memory device can be read out by the same connectivity used for driving the luminaire, so that the driver can be informed about required operation conditions. The driver can thus learn about the service-related information before starting to drive the luminaire.

A driving circuit includes a control circuit and a boost converter circuit. The control circuit receives a sense voltage associated with a direct-current (DC) source voltage, and generates a control signal with a duty cycle that varies with the sense voltage in a monotonically increasing manner. The boost converter circuit receives the DC source voltage and the control signal, thereby providing a driving current for driving light emission of a light emitting component. The driving current has a magnitude positively correlated to the duty cycle of the control signal.

Methods and apparatus for a security light having a remote photovoltaic module is set forth. The security light includes a primary rechargeable battery connected to the remote photovoltaic module while also having a backup battery system to be utilized when the rechargeable batteries condition require recharge. The security lighting unit functions as a security light to provide variable wide area illumination based upon environmental and battery conditions and also which power supply is optionally connected to the load, the load being the illumination sources and the various supportive electronics. The system further includes a controller which can not only operationally selects either the rechargeable batteries or backup batteries but also can monitor battery condition to preserve battery life. In operation, the security light may include a variable battery power supply for ease of installation.

A lighting device with a conversion element is provided. It may be irradiated with excitation radiation from an electromagnetic radiation source. Provision is made of an optical component for the radiation emanating from the conversion element and provision is made of a sensor for detecting radiation emanating from the conversion element and/or for detecting radiation emanating from the radiation source.

The lighting device includes a power conversion circuit and a control circuit. The power conversion circuit includes a high voltage side output terminal and a low voltage side output terminal to be connected to a light source, and a step-down chopper circuit. The control circuit performs a lighting operation of controlling the power conversion circuit to develop a DC output voltage between the high voltage side output terminal and the low voltage side output terminal. The control circuit starts a protective operation of limiting a current to be supplied to the light source when the output voltage is equal to or higher than a threshold value. The threshold value is in a range of 1.2 to 1.3 times a rated voltage of the light source.

A lighting system includes an LED downlight mountable to a ceiling, a driver, and an insulation displacement connector (IDC). Light from the downlight can be faced downward to project light or upward to reflect light off of the ceiling. The driver has an input with a first voltage and an output with a second voltage, the second voltage being lower than the first and being provided through a wire system extending from the LED driver. The IDC connects the downlight to the wire system. The lighting system can be changed from a first to a second configuration by at least one of adding an additional downlight using a corresponding MC or removing an existing downlight using a corresponding IDC. The second configuration does not significantly affect a desired output range of light from any downlight or any LED circuit of any downlight that remains or preexists from the first configuration.