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Cove lighting is a form of indirect lighting built into ledges, recesses, or valances in a ceiling or high on the walls of a room. It directs light up towards the ceiling and down adjacent walls. [1] It may be used as primary lighting, or for aesthetic accent, especially to highlight decorative ceilings.
Cove light – indirect lighting recessed into the ceiling in a long box against a wall. Troffer – recessed fluorescent light fixtures, usually rectangular in shape to fit into a drop ceiling grid. Chandeliers in the Bibliothèque Mazarine (Paris) Surface-mounted light – the finished housing is exposed, not flush with the surface.
For example, some of the light emitted by a luminaire may exit away from the desired plane and is therefore wasted. A CU measures the light actually reaching the desired plane as a percentage of the total light produced by the fixture. The value for direct lighting varies from 0.2 to 0.5 while that of indirect lighting varies from 0.1 to 0.3
While indirect lighting can create a diffused and shadow free light effect it can be regarded as an uneconomical lighting principle. [12] [13] Front lighting is also quite common, but tends to make the subject look flat as its casts almost no visible shadows. Lighting from the side is the less common, as it tends to produce glare near eye level.
Daylighting is the practice of placing windows, skylights, other openings, and reflective surfaces so that direct or indirect sunlight can provide effective internal lighting. Particular attention is given to daylighting while designing a building when the aim is to maximize visual comfort or to reduce energy use.
An LED strip, tape, or ribbon light is a flexible circuit board populated by surface-mount light-emitting diodes (SMD LEDs) and other components that usually comes with an adhesive backing. Traditionally, strip lights had been used solely in accent lighting, backlighting, task lighting, and decorative lighting applications, such as cove lighting .