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

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

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

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.

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

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

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

Lumber cut and dressed to standard sizes.

Lumber that is edge dressed to make a lapped joint.

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.

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

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

A unit for measuring the flow of light energy.

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

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

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

The emission of light not directly caused by incandescence.

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

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