Also known as spirit levels, these are devices consisting of a sealed glass tube partially filled with alcohol or other liquid, containing an air bubble whose position reveals whether a surface is perfectly level.

In building wiring, a light switch is a switch, most commonly used to operate electric lights, permanently connected equipment, or electrical outlets. Portable lamps such as table lamps will have a light switch mounted on the socket, base, or in-line with the cord. Manually operated on/off switches may be substituted by remote control switches, or light dimmers that allow controlling the brightness of lamps as well as turning them on or off. Light switches are also found in flashlights and automobiles and other vehicles.

Also known as phototherapy, light therapy consists of exposure to daylight or to specific wavelengths of light using polychromatic polarised light, lasers, light-emitting diodes, fluorescent lamps, dichroic lamps or very bright, full-spectrum light, usually controlled with various devices. The light is administered for a prescribed amount of time and, in some cases, at a specific time of day. It can be used in the treatment of skin disorders, sleep disorder and some psychiatric disorders.

Accessories for lighting such as bulbs and cables.

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Structure including metallic rod placed on top of buildings. If lightning strikes it will preferentially strike the rod and be conducted to ground through the wire, instead of passing through the structure, where it could start a fire or cause electrocution.

Device which improves the quality of power that is delivered to electric load equipment.

Here can be a short description of this collection.

Here can be a short description of this collection.