Signed "Sight Light Corp, New York" desk lamp with Halophane crystal glass shade. Brass candelabra light socket and bulb.
A holophane is a type of lighting fixture or lens, named after the brand, known for its durable, ribbed borosilicate glass that uses prisms to refract and distribute light evenly, reducing glare and creating a uniform glow, commonly seen in industrial, street, and vintage lighting. Invented in the 1890s, the term comes from Greek words meaning "whole" and "appear," reflecting its ability to provide a completely luminous appearance, used in everything from factories to historic buildings.