A 

 – Refers to a measure of the amount of light absorbed by an object, instead of being reflected. Dark colored and matte surfaces are the least likely to reflect light. Accent Lighting –

ADA-compliant fixtures cannot extend more than 4” from the wall. Ambient (General) Lighting –

The amount of electrical current through a conductive source. Angle of Reflectance –

A decorative-shaped tube or casting that is used to support a socket. An arm usually has socket wires running through it.

The part of a fixture that mounts to a wall or vertical surface. Ballast –

What everyone calls it except the lighting industry, which calls it a "lamp."

The decorative plate that attaches to the ceiling to cover the junction box. Chandelier

A group of matching fixtures and/or lamps that together can bring a unified look to a home or room. Color Temperature –

A measure of how light sources render colors. The higher (to 100) the CRI, the better the color rendering, given the color temperature of the lamp.