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A set of four glass downlighters,
each with a ribbed glass domed shade, bearing the maker's stamp to the rim,
Holophane is a manufacturer of lighting-related products founded in 1898 in London. The company is noted for its glass reflectors, refractors and lenses.
The hallmark of Holophane "luminaires" is the borosilicate glass reflector/refractor. The glass prisms provide a combination of uplight and downlight to illuminate any environment evenly without creating dark spots or glare. This ribbed glass shade/reflector, "Holophane", is iconic in vintage lighting, and is emulated throughout the lighting industry.