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Lighting & Design Glossary - O


A general term for any traditional design that hails from the "Old World," or Europe. Items of this style tend to have an antiqued look, with deep yet muted natural colors. Such items also often incorporate floral and scroll patterns.


Organic Light Emitting Diode. OLEDs are made of thin strips of organic molecules that create light when connected to electricity. They are flexible, energy efficient, strong and lightweight. Decorative OLED lighting fixtures are just starting to appear in the U.S. market.


A form of quartz, either solid black or, more commonly, in banded colors. The name comes from the Greek word for "claw" or "fingernail," probably because the flesh color and sheen of a banded variety of onyx resemble that of a fingernail.

Opal/Opalescent Glass

Translucent or opaque glass, usually of a single milky white hue or two or more swirling colors; usually smooth, glossy surface texture.


Allows light to pass through, but greatly obscured.

Optic Glass

Slightly wavy, watery-looking glass surface texture.

Overall Height (OAH)

The total hanging length of a suspension fixture, including fixture/shade height, suspension cable/chain/downrod length and canopy height. Also known as Suspension Length.