Linear lighting is defined as a linear shape luminaire (opposed to square or round). Most commonly they appear as a continuous strip, with even brighness along the optical (opal) diffuser. Such configurations are used in workplace lighting, schools, offices, retail or circulation places among the others.

Linear profile luminaires may be equipped with point sources and precise optics for specific applications where focal illumination or very low direct glare from luminaire is required around a specific area or task, also to support an architectural intent to create dramatic lighting or highlight an object or intensify  certain visual impact of a surface or shapes.

Usually, these lights are long in length and are installed as either suspended from a ceiling, surface mounted to a wall or ceiling or recessed into a wall or ceiling or joinery.

Light (direction) output is mostly DOWN, but some profiles allow for both,  DOWN and UP or only UP light distribution.