Recessed light
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A recessed light or downlight (also pot light in Canadian English, sometimes can light [for canister light] in American English) is a light fixture that is installed into a hollow opening in a ceiling. When installed it appears to have light shining from a hole in the ceiling, concentrating the light in a downward direction as a broad floodlight or narrow spotlight.
There are two parts to recessed lights, the trim and housing. The trim is the visible portion of the light. It is the insert that is seen when looking up into the fixture, and also includes the thin lining around the edge of the light. The housing is the fixture itself that is installed inside the ceiling and contains the light socket.
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[edit] History
The earliest recessed lights were developed around the early 1940s. During that same time more light manufacturers were producing recessed lighting for residential and commercial developments.[citation needed]
[edit] Types of housing
In North America, recessed housings generally fall into one of four categories. IC or “insulation contact” rated new construction housings are attached to the ceiling supports before the ceiling surface is installed. IC housings must be installed wherever insulation will be in direct contact with the housing. Most IC housings are rated to a 75-watt maximum. Non-IC rated new construction housings are used in the same situations as the IC rated new construction housings, only they require no insulation or at least four-inch (10cm) spacing from insulation. These housings are typically rated up to 150 watts. IC rated remodel housings are used in existing ceilings where insulation will be present. Non-IC rated remodel housings are used for existing ceilings where no insulation is present. Once again, these also require no insulation or at least 4”/10cm spacing from insulation. Sloped-ceiling housings are available for both insulated and non-insulated ceilings that are vaulted.
The main purpose of the housing is to ensure that no flammable materials come into contact with the hot lighting fixture. Badly-housed downlights can be a fire hazard, though all newer ones contain a thermal reset switch for safety.
[edit] Trim styles
Recessed lighting styles have evolved with more manufactures creating quality trims for a variety of applications. You can find recessed lighting trim with the standard baffle in black or white, which is the most popular. They are made to absorb extra light and create a crisp architectural appearance. There are cone trims which produce a low-brightness aperture. Multipliers are offered which are designed to control the omni-directional light from "A" style incandescent light bulbs and compact fluorescents. Lens trim is designed to provide a diffused light and protect the lamp. Lensed trims are normally found in wet locations.
The luminous trims combine the diffused quality of lensed trim but with an open down light component. Adjustable trim allows for the adjustment of the light whether it is eyeball style, which protrudes from the trim or gimbal ring style, which adjusts inside the recess. These lights allow for full versatility. Lastly, there are the wall-washer trims, which are designed to eliminate the often seen "scalloped light effect".
[edit] Lamp types
There are two types of light bulbs for recessed lighting: directional and diffuse. Directional lamps (R, BR, PAR, MR) contain reflectors that direct and control the light. Diffuse lamps (A, S, PS, G) control light distribution through their omni-directional light.
