Prism lighting

A prism transom bends light passing through the upper part of the window upwards.

Prism lighting is the use of prisms to improve the distribution of light in a space. It is usually used to distribute daylight, and is a form of anidolic lighting.

Prism lighting was popular from its introduction in the 1890s through to the 1930s, when cheap electric lights became commonplace and prism lighting became unfashionable. While mass production of prism lighting systems ended around 1940,[1] the 2010s have seen a revival using new materials.[2]

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