Electronic light emitting flares and related methods. Flares of the present invention include various features such as self-synchronization, remote control, motion-actuated or percussion-actuated features, dynamic shifting between side-emitting and top-emitting light emitters in response to changes in positional orientation (e.g., vertical vs. horizontal) of the flare; overrides to cause continued emission from side-emitting or top-emitting light emitters irrespective of changes in the flare's positional orientation; use of the flare(s) for illumination of traffic cones and other hazard marking or traffic safety objects or devices, group on/off features, frequency specificity to facilitate use of separate groups of flares in proximity to one another, selection and changing of flashing patterns and others.

A method is described for adjusting the brightness of at least one LED according to a changing supply voltage provided to the at least one LED includes acquiring a parameter which indicates the changing supply voltage; and providing, on the basis of the acquired parameter, a control voltage of the at least one LED for adjusting an LED current such that the at least one LED has a predefined relative brightness change over the predefined voltage range. A control unit and an LED lamp which implement the method described here are also discloses. Furthermore, an LED lighting apparatus and a medical diagnostic device having the LED lamp disclosed here are described.

A light guide device is provided. The light guide device includes a light guide member and a reflective member. The light guide member includes a junction surface, a first light incident member, a second light incident member, a contact surface, and a reflective curve surface. The reflective member includes a reflective surface adapted to the reflective curved surface and the contact surface of the light guide member. The first light receiving member and the second light receiving member respectively aligned to a first light-emitting element and a second light-emitting element, and are used to receive light emitted by the first light-emitting element and the second light-emitting element and guide the received light out.

In accordance with certain embodiments, lighting systems feature lightsheets including multiple illumination units or modules electrically interconnected such that unremoved illumination units or modules remain energized upon removal of at least a portion of one or more illumination units or modules.

A resonant power converter is provided with capacitive switching mode protection. The converter produces output current and voltage according to an operating frequency, which is desirably maintained above a resonant frequency for the power converter. A controller regulates the operating frequency based on an output current relative to a reference value, which may be provided via a dimming interface. A capacitive switching mode is determinable, based on a positive relationship in a detected direction of change in an output value relative to a detected direction of change in the operating frequency. When the capacitive switching mode is determined, a preceding operating frequency is enacted and the controller disables regulation of the operating frequency therefrom. Inductive mode switching is determinable with a negative relationship between detected direction of change in the output value relative to direction of change in the operating frequency, wherein regulation of operating frequency is renewed.

The present invention provides a control method for a smart light, comprising: displaying control information of connected smart lights as a first kind of icon and/or a second kind of icon on a main interface, the first kind of icon corresponds to a single light and the second kind of icon corresponds to a group consisting of at least two single lights; when detecting at the position of the first kind of icon and the second kind of icon and identifying as selected operation, displaying a control interface corresponding to the single light or the group; the control interface comprises a light-adjusting tab, the light-adjusting tab comprises a parameter adjustment column, a switch button and an effect simulation diagram; when the light-adjusting tab is on active page, sending parameter configuration information to corresponding single light or group based on sliding position of detected slider in the parameter adjustment column, and sending switch light configuration information to corresponding single light or group based on state change of detected switch button, and displaying the effect simulation diagram based on the parameter configuration information and the switch light configuration information.

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 self-healing overtemp circuit is described and illustrated comprising a temperature sensing circuit, a voltage sensing circuit, and optionally, a current sensing circuit. The self-healing overtemp circuit is designed to ramp down power in an LED lighting system (or other electrical circuit) in response to a sensed or impending thermal runaway (and optionally, overcurrent) event. Said thermal runaway and overcurrent events may be a result of failure of one or more components (e.g., driver, active cooling means) of the lighting system. The self-healing overtemp circuit further comprises means of restoring power to said LEDs in a manner that avoids (i) a perceivably bright flash of light or (ii) increased risk of component failure.

A configurable wall mount light switch for use in controlling multiple light fixtures. In one embodiment, the switch includes a touch screen display, a transceiver and a programmable microcontroller. The microcontroller may be programmed to display a plurality of interface elements on the touch screen display for selection by a user to control one or more light fixtures. Typically, the switch is dimensioned to be received by a single gang electrical box.

The present invention relates to a method for determining a growth status of a plant comprising chlorophyll, the method comprising the steps of: illuminating the plant (102) with input light including a light intensity modulation component (205, 206, 207, 208); detecting light emitted from the plant; determining (S702) an offset light intensity (204) surrounding the plant, the offset light intensity being a static component of the input light; determining (S718) a phase and a gain between the input light and the detected light, determining (S720) a growth status of the plant based on a predetermined relationship between input light and detected light, and on the phase and the gain. The invention also relates to a corresponding system and to a computer program product.