Abstract: Power consumed by an LED driver may be reduced by drawing, from an electronic transformer or dimmer, an input current that is constant over a plurality of input voltages. Power derived from the constant input current is provided to the LED driver.

Abstract: A voltage level supplied to power a plurality of LED light fixtures is dynamically adjusted to control the headroom of the voltage level. The current drawn by at least one of the plurality of LED light fixtures is monitored, and the voltage is increased from zero until the monitored current reaches its maximum.

Abstract: A thermal-foldback system detects an over-temperature condition in an LED lamp. In response to the over-temperature condition, the thermal-foldback system chops a portion of the input power waveform drawn by the LED lamp.

Abstract: In accordance with certain embodiments, a power signal for driving an LED lighting system is analyzed on a timeslice basis, and the signal is adjusted (e.g., on a timeslice basis) to compensate for deviations therein.

Abstract: A brightness controller determines a dimmer setting and adjusts brightness of a light source according to the dimmer setting.

Abstract: A permanent adapter for incandescent lighting fixtures can removably receive LEDs but cannot itself be removed from the fixture.

Abstract: In accordance with certain embodiments, a method of monitoring traffic includes capturing a plurality of time-separated images of a moving vehicle, calculating a velocity of the vehicle based on at least two of the images, and obtaining vehicle-identifying information from at least one of the images or transmitting a notification to a central location if the velocity is greater than a threshold velocity.

Abstract: LEDs that provide street illumination are used to create emergency signals. This facilitates simple retrofitting of existing streetlighting infrastructure. In one embodiment, a streetlight comprises an LED set that itself comprises or consists of a plurality of LEDs collectively producing a white light output. The streetlight also includes a receiver for receiving a signal of an alarm condition, and a controller for (i) disabling the LED set during a daylight period, (ii) maintaining the normal operating mode during a lighting period distinct from the daylight period, and (iii) in response to the alarm condition detected by the receiver, de-activating at least one of the LEDs to produce a non-white (e.g.

Abstract: In various embodiments, a startup circuit for a low-voltage-lighting electronic transformer includes a low-impedance output circuit. At the beginning of an AC signal cycle, the low-impedance output circuit presents a low-impedance path to the output of the transformer, thereby causing a surge of current in the transformer and initiating oscillation therein.

Abstract: A thermal foldback circuit protects a lamp circuit component from overheating by limiting power to the lamp in response to an over-temperature condition. The amount of limiting is adjusted based at least in part on an input from an external power-reduction source, such as a dimmer.

Abstract: In accordance with certain embodiments, an illumination device includes a light-emitting diode and a light-guiding optical component comprising a channel therethrough.

Abstract: There is provided a new and useful illumination system for use on portable insulated containers that do not have onboard or self-contained powered cooling systems. The illumination system will illuminate the contents of the container when the lid is opened.

Abstract: There is provided a new and useful invention for use on a school bus that reduces the cost of manufacturing the bus as well as the warning lights. Combining the functionality of the red warning lights and the amber warning lights into a lighting package where each light can emit both red and amber colors reduces the number of warning lights required on a school bus from eight warning lights to four warning lights or less. The dual color functionality can be achieved using light emitting diodes and appropriate optical design methods.

Abstract: There is provided a new and useful alarm system for use on a school bus that ensures that drivers walk through the inside of a vehicle prior to exiting. Once the vehicle ignition system has been in the on position for a specified period of time, or the vehicle has traveled at or above a pre-determined speed, the system will enter a set state. The system may also feature means for turning on the interior lights of the vehicle to aid the driver during their visual sweep of the vehicle. The system may also feature means for dis-engaging deactivation means at the rear of the vehicle if it is in the alarm state.