Single-ended compact fluorescent lamp consisting of two twin tubes on a single base.

Or quartz-halogen; terms for a Halogen Lamp. The term derives from the quartz glass capsule that encloses the filament and halogen gas. Quartz glass can withstand the high pressure of the halogen lamp but it transmits more UV radiation than ordinary hard glass. Touching the quartz glass with bare hands leaves an oily residue that reduces lamp life.

Also known as reflector lamp. Soft-glass reflectorized lamp with a generally smooth distribution.

See Average Rated Life.

See Duplex Outlet.

Fixture mounted above the ceiling. With downlights, only the Aperture and Trim visible from below. With fluorescent troffers and luminous ceilings, only the covering is visible. Recessed fixtures provide direct downlighting.

Fixture mounted above the ceiling. With downlights, only the Aperture and Trim visible from below. With fluorescent troffers and luminous ceilings, only the covering is visible. Recessed fixtures provide direct downlighting.

Percentage of light reflected from a surface.

Percentage of light reflected from a surface.

Glare from the Specular Reflection of bright light sources. You often experience reflected glare when looking at a computer screen, when reading a glossy magazine, or when working on a polished counter surface.