A small source of light, such as most incandescent lamps. The term is also used to denote some fixtures, such as open downlights and track lights.

Heat and shatter resistant plastic, usable indoors and out. Versatile polycarbonate can be transparent, translucent, or opaque.

Heat and shatter resistant plastic, usable indoors and out. Versatile polycarbonate can be transparent, translucent, or opaque.

The relationship between power consumption (watts) and current draw (amps) in an electrical device. The most efficient ballasts and transformers have a High-Power Factor (max is 1.0). Low power factor devices require additional circuiting and larger wires.

The relationship between power consumption (watts) and current draw (amps) in an electrical device. The most efficient ballasts and transformers have a High-Power Factor (max is 1.0). Low power factor devices require additional circuiting and larger wires.

Connection point that brings electricity to track and other lighting systems. Power feed may be at the end, floating, or at an intersection.

Connection point that brings electricity to track and other lighting systems. Power feed may be at the end, floating, or at an intersection.

A fluorescent lamp that uses a starting switch to pre-heat the electrodes in to start the lamp. Most small compact fluorescent lamps are preheat types.

A fluorescent lamp that uses a starting switch to pre-heat the electrodes in to start the lamp. Most small compact fluorescent lamps are preheat types.

Setting for a dimmer that can be selected without readjusting the dimmer intensity level each time; usually activated by a rocker or pushbutton. A preset scene is a setting for several channels or zones in a multi-scene dimming system.