Lighting controller including control system having first control facility and second control facility. First and second control facilities respectively are for controlling first and second visible-light sources including first and second pluralities of semiconductor light-emitting devices spaced apart from and along longitudinal axis. First and second visible-light sources respectively are positioned for directing first and second beams of first and second visible-light emissions from first and second pluralities of semiconductor light-emitting devices in first and second beam directions. First and second control facilities respectively are programmed for controlling first and second intensities of first and second beams of first and second visible-light emissions. Control system is programmed for modulating first intensity of first beam and second intensity of second beam in manner for causing first and second beams of first and second visible-light emissions to collectively emulate progression of ambient sunlight. Lighting systems and lighting control methods.

A lighting device includes a housing, a power supply, a first light source such as a LED, a variable focus lens adapted to vary the focus of light from the first light source, a switch and a controller having circuitry, The circuitry is adapted to control the current to the first light source based upon a voltage of the power supply, and is adapted to control variability of the variable focus lens.

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 hydroponics apparatus includes a housing; two or more channels provided vertically on one side of the housing to be spaced apart from each other; brackets coupled to the channels; and cultivation modules seated on the brackets, wherein a plurality of cultivation modules is fitted and coupled to each other to have an extended form and water channels are formed to communicate with each other, the cultivation modules in the extended form are coupled to each channel and seated through a plurality of brackets disposed in a horizontal direction, and the plurality of brackets are coupled to the channels so that heights are gradually increased or decreased from one-side bracket in the horizontal direction to the other bracket in the horizontal direction to form an inclination of the water channel.

A compact conditioning system for controlling a volume, comprises: (a) at least one light source, said light source being coupled with a replaceable focusing lens; (b) at least one fan; (c) at least one temperature sensor; (d) control circuitry adapted to receive inputs from said sensor(s) and/or from a user, and to operate said light source(s) and/or said fan(s) as a result thereof; and (e) a housing suitable to house said light source, fan and control circuitry and adapted to be positioned at the top of a structural element defining a closed space.

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.

Power tool for crimping or cutting and object, the tool having vents in the tool housing for enabling airflow wherein such vents have a partition member extending across them for restricting liquid water and dust ingress, and method of assembly. Power tool for crimping or cutting an object, the tool having a switch wherein the switch is provided on a support that is clamped between opposing tool housing portions for forming a seal to restrict the ingress of liquid water into the tool housing interior via the switch, and method of assembly. Power tool for crimping or cutting an object, the tool having an arrangement of light emitting elements directed towards an operative part of the tool for indicating operational information to a user without requiring the user to remove their gaze from the operative part of the tool in use.

A lighting fixture is provided. The lighting fixture includes a sensor, a first power circuit configured to produce a first driving current for the sensor, a second power circuit a first power circuit configured to produce a second driving current for the sensor, and a switching device connected to the power supply. The switching device is configured to move between a first position and a second position, and to connect the first power circuit to a power supply in the first position, and connect the second power circuit to the power supply in the second position.

A torch (1), which is producible at low cost and is operable comfortably with one hand, irrespective of a gripping position, includes a torch head (2) which has a lighting unit (18), including a housing (3) configured as a gripping piece that extends along a longitudinal axis (L) and has a closed end section (4) at the rear. A linear-travel switch with a slide (5) operates the torch (1). The slide (5) is slidably and captively mounted on the housing (3). The slide (5) is formed in an L-shape with a first section (6) and a second section (9). The first section (6) extends longitudinally and axially along the housing (3) and the second section (9) engages behind (or catches behind) the closed end section (4) of the housing (3), so that the linear-travel switch can be operated in different gripping positions.

Power tool for performing work on an object such as crimping or cutting the object, the tool having vents in the tool housing for enabling airflow, wherein such vents have a partition member extending across them for restricting liquid water and dust ingress, and method of assembly. Power tool for performing work on an object, the tool having a switch, wherein the switch is provided on a support that is clamped between opposing tool housing portions for forming a seal to restrict the ingress of liquid water into the tool housing interior via the switch, and method of assembly. Power tool for performing work on an object, the tool having an arrangement of light emitting elements directed towards an operative part of the tool for indicating operational information to a user without requiring the user to remove their gaze from the operative part of the tool in use.