Nerve endings in the “non-focal” area of the retina of the eye. Rods are very sensitive but see only black and white.

The process of wiring a home and installing the Rough-In Sections of fixtures and the Back Boxes of electrical devices; precedes the finishing work.

The process of wiring a home and installing the Rough-In Sections of fixtures and the Back Boxes of electrical devices; precedes the finishing work.

UL term for the part of a recessed downlight that mounts to the building and connects to the electrical circuit. Housings, Cans, Frame-In Kits, Rough-Ins, and Rough-In Kits are all industry terms for the rough-in section. A Finishing Section attaches to the rough in; it provides the optics and trims out the ceiling.

UL term for the part of a recessed downlight that mounts to the building and connects to the electrical circuit. Housings, Cans, Frame-In Kits, Rough-Ins, and Rough-In Kits are all industry terms for the rough-in section. A Finishing Section attaches to the rough in; it provides the optics and trims out the ceiling.

Corrosion of metal, particularly iron and steel, from exposure to moist air and other elements; also called oxidation. Rust is a reddish-brown finish that can be produced by paint or chemical process.

Corrosion of metal, particularly iron and steel, from exposure to moist air and other elements; also called oxidation. Rust is a reddish-brown finish that can be produced by paint or chemical process.

A process where molten metal is poured into a mold of compacted sand. The molds can be used only once. The process is costly, including finishing the rough casting.

A process where molten metal is poured into a mold of compacted sand. The molds can be used only once. The process is costly, including finishing the rough casting.

Slightly textured or brushed surface, having a fine grain, that reflects light with some diffusion.