While it is well known to power traffic control devices (for example, traffic lights) by an alternative energy source during power outages, some embodiments of the present invention additionally have: (i) a set of control computer(s), remote from the various traffic control devices, that is powered by an alternative energy source during a power outage; and/or (ii) a communication network, for communications between the set of control computer(s) and the various traffic control devices, that is powered by an alternative power source during a power outage. The use of alternative power to power the control computer(s) (for example, a hub) and/or the communication network allows the traffic control devices to continue to operate in a coordinated manner as instructed by the control computers, thereby avoiding a situation where the traffic lights begin operating independently of each other during a power outage.

While it is well known to power traffic control devices (for example, traffic lights) by an alternative energy source during power outages, some embodiments of the present invention additionally have: (i) a set of control computer(s), remote from the various traffic control devices, that is powered by an alternative energy source during a power outage; and/or (ii) a communication network, for communications between the set of control computer(s) and the various traffic control devices, that is powered by an alternative power source during a power outage. The use of alternative power to power the control computer(s) (for example, a hub) and/or the communication network allows the traffic control devices to continue to operate in a coordinated manner as instructed by the control computers, thereby avoiding a situation where the traffic lights begin operating independently of each other during a power outage.

A method of inactivating one or more pathogens in an environment. The method includes providing light from at least one lighting element of a lighting device installed in the environment, the at least one lighting element configured to provide light toward a target area in the environment, the provided light having at least a pathogen-inactivating first component in a first range of wavelengths of 400 nanometers to 420 nanometers. The pathogen-inactivating first component of light produces an irradiance of at least 0.01 mW/cm.sup.2 as measured at a surface in the target area that is unshielded from the lighting device and located at a distance of 1.5 meters from an external-most luminous surface of the lighting device. Providing the light causes the one or more pathogens to be inactivated.

A power tool includes a housing containing a motor, an output member configured to be driven by the motor to perform an operation on a workpiece, and a handle having a first end portion coupled to the housing and a second end portion. A base is coupled to the second end portion of the handle. A light emitting assembly is pivotably coupled to the base. The light emitting assembly is configured to be operable in a first mode to illuminate a workpiece and a second mode to indicate a condition of the power tool responsive to the power tool signaling the condition to the light emitting assembly.

A power tool includes a housing containing a motor, an output member configured to be driven by the motor to perform an operation on a workpiece, and a handle having a first end portion coupled to the housing and a second end portion. A base is coupled to the second end portion of the handle. A light emitting assembly is pivotably coupled to the base. The light emitting assembly is configured to be operable in a first mode to illuminate a workpiece and a second mode to indicate a condition of the power tool responsive to the power tool signaling the condition to the light emitting assembly.

A method of providing doses of light sufficient to deactivate bacteria throughout a volumetric space. The method includes: (1) receiving data associated with a desired illuminance level for the space, indicative of an estimated occupancy of the volumetric space over a pre-determined period of time, and indicative of dimensions of the space; (2) determining, based on the received data, an arrangement of one or more lighting fixtures in the volumetric space, the one or more lighting fixtures configured to at least partially emit disinfecting light having a wavelength of between 400 nm and 420 nm, and a total radiometric power to be applied via the one or more lighting fixtures to produce a desired power density at any exposed surface within the volumetric space during the period of time; and (3) installing the determined arrangement of one or more lighting fixtures in the volumetric space.

A high-power light system includes a lamp for producing light within a designated wavelength range, a chiller for maintaining the lamp below a defined temperature threshold, and a control module for regulating operation of both the lamp and the chiller. The lamp includes a plurality of light emitting diodes (LEDs) arranged into independently-operable modules. In use, the control module selectively overdrives the LEDs to yield high-power light within the designated wavelength range. To prevent overheating within the lamp, the control module restricts the lamp to a pulse-based operational cycle, whereby each period of LED activation is of limited duration and is immediately followed by a period of deactivation at least three times as long in duration as the period of activation. Additionally, one or more temperature sensors are disposed within the lamp and enable the control module to temporarily suspend LED activation when measured temperature levels exceed the defined threshold.

A high-power light system includes a lamp for producing light within a designated wavelength range, a chiller for maintaining the lamp below a defined temperature threshold, and a control module for regulating operation of both the lamp and the chiller. The lamp includes a plurality of light emitting diodes (LEDs) arranged into independently-operable modules. In use, the control module selectively overdrives the LEDs to yield high-power light within the designated wavelength range. To prevent overheating within the lamp, the control module restricts the lamp to a pulse-based operational cycle, whereby each period of LED activation is of limited duration and is immediately followed by a period of deactivation at least three times as long in duration as the period of activation. Additionally, one or more temperature sensors are disposed within the lamp and enable the control module to temporarily suspend LED activation when measured temperature levels exceed the defined threshold.

A priority control circuit for the operation of vehicle lamps. The priority control circuit includes a first circuit and a second circuit. The first circuit includes a first PNP transistor, a first NPN transistor having a gate connected to a collector of the first PNP transistor, and a first output port connected to a collector of the first NPN transistor. When a first lamp turn-on signal for turning on a first lamp is input, the first circuit turns on a second lamp and a third lamp. The second circuit includes a second NPN transistor, a second PNP transistor having a gate connected to a collector of the second NPN transistor, and a second output port connected to a collector of the second PNP transistor. The second circuit controls priorities for the operation of the second lamp and the third lamp.

Provided is a portable IPL sterilizer comprising: a body partitioned into a central region and a peripheral region surrounding at least a portion of the central region; a xenon lamp light source for sterilization provided in the central region of the body; and a light-shielding comb part provided in the peripheral region of the body.