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Ceiling fixtures require proper air sealing -  Light fixtures below an unheated attic must be tightly sealed to prevent air from leaking into the attic space. Air leaks not only waste energy, they are the primary cause of ice dams. Methods of sealing include:

  • Recessed fixtures. New or retrofit  recessed fixtures (including new  LED fixtures) should have airtight  cans and gasket seals. Existing  recessed lights can have airtight  boxes sealed over them from the  attic side.
  • Flush-mount fixtures. Electrical  boxes should be sealed with  spray foam around any cracks or  openings into the attic.  Caution: Disconnect power to  circuit until foam cures!

Fixtures

The devices that contain light bulbs are known as fixtures. Although  it may not seem obvious at first glance, fixture choices can have a significant  effect on the usefulness of lighting—and that can influence the  energy use as well.

Surface mount fixtures

Typically found on ceilings or walls, surface-mounted fixtures are attached directly to an electrical box and often controlled by a wall switch. Usually designed to provide general illumination, these fixtures frequently have some type of diffuser that spreads light throughout the room. Surface-mounted fixtures can be as simple as an open porcelain bulb holder or as complex as a dining room chandelier. Depending on the design of the fixture, acceptable bulbs may include any style that distributes light broadly in all directions.

Track lighting, which can be either standard voltage or low voltage, are also usually surface-mounted fixtures. Often used as accent lighting or to illuminate art, track lighting can also be used to provide focused task lighting in kitchens or work areas.

Recessed fixtures

Light fixtures that are recessed into the space above the finished ceiling are commonly known as down lights or can lights. Designed to provide focused light at a particular location, these fixtures are controlled by a wall switch and use reflector bulbs that direct light straight down. Some fixtures may also have partial shields or reflectors that direct the light towards the side. Because of the risk of heat buildup in these types of fixtures, it is important to properly match both the size and type of bulbs to the fixture. Recessed light fixtures that enter the attic space are required to be sealed and insulated to avoid air leakage and fire hazards.

Plug-in fixtures

Light fixtures that are not directly wired to the home electrical system require a cord to plug into an outlet. These include floor, table, and desk lamps as well as specialty lighting like under-cabinet lamps or picture lights.

The flexibility of many plug-in lamp fixtures makes them a good choice for a variety of lighting needs. However, the use of cords (and extension cords) for plug-in lamp fixtures can present hazards. Cords should run along walls wherever possible and should not extend into traffic areas. Extension cords should be rated by Underwriters Laboratories for the intended use. If cords or plugs are cracked or loose, they should not be used until repaired. Using the proper bulb in plug-in fixtures is also important. Heat buildup from an over-sized bulb can be a fire risk.