Lumber that has not been surfaced but may be sawn, edged, and trimmed.

Lumber that is edge dressed to make close tongue-and-groove edge joints.

The size of lumber after it has been sawn to size but has not been surfaced.

Lumber that is edge dressed to make a lapped joint.

Lumber nominally less than 2 inches thick and 2 inches or more in width.

Lumber intended to be cut up and used in some manufacturing process.

Lumber cut and dressed to standard sizes.

Lumber that is shaped to a pattern or to a molded form.

The size of lumber after it has been cut to size and the surfaces planed.

Lumber that has been mechanically tested to determine its stiffness and bending strength.

the luminous intensity of a surface of a given area viewed from a given direction.

The emission of light not directly caused by incandescence.

A unit for measuring the flow of light energy.

Lumber that is intended for use where allowable strength or stiffness of the piece is known.

A photoelectric instrument used to measure luminance. Also called a light meter.

The rate of flow of light energy through a surface, expressed in lumens.

The force that generates visible light express by candela, lumens per steradian, or candlepower.

A measure of the capacity of a material to transmit incident light in relation to the total incident light striking it.

Unit of measure for total light output. The amount of light falling on a surface of one square foot.

A complete lighting unit consisting of one or more lamps plus elements needed to distribute light, hold and protect the lamps, and connect power to the lamps. Also called a lighting fixture.