
1) Glassmaking company 2) Lighting brand
Found on
https://www.crosswordclues.com/clue/holophane

Holophane, a division of Acuity Brands, is a manufacturer of lighting-related products founded in 1898 in London, England. The company is a UK-based (Milton Keynes, England) and US manufacturer (based in Newark, Ohio) of lighting fixtures for commercial, industrial, outdoor, and emergency applications. The company is noted for its glass reflector/...
Found on
http://en.wikipedia.org/wiki/Holophane

a brand of glass having a surface pattern of small, lenslike areas for even diffusion of light.
Found on
https://www.infoplease.com/dictionary/holophane
No exact match found.