Alumina coatings for an electric lamp

摘要

A light diffusion coating for an electric lamp is described which comprises a thin layer of spherical alumina particles that have been vapor-deposited in a certain particle size range to provide more effective light scattering. The coatings are deposited upon the interior surface of the sealed glass envelope and have been found especially useful for incandescent lamps as well as for such other lamps as electric discharge lamps.