Blue enriched incandescent lamp has filament emitting below 420 nm and stimulating a fluorescent layer on the envelope to emit between 420 and 490 nm

摘要

A blue-enriched incandescent lamp (10) comprises a transparent envelope containing a filament (16) that emits below 420 nm when operating. A fluorescent layer on the upper inner surface of the envelope emits in the range 420-490 nm when stimulated by light from the filament.