Patent ID: 8866372

Claim:
A mercury vapor discharge fluorescent lamp, comprising: a lamp envelope enclosing a discharge space and having an inner surface; an ionizable medium within said lamp envelope comprising mercury and an inert gas; and a phosphor layer comprising a phosphor blend disposed on said inner surface, said phosphor blend comprising: a calcium halophosphor, a blue phosphor having an emission peak at about 440 nm to about 490 nm, a blue-green phosphor having an emission peak at about 475 nm to about 530 nm, and a red phosphor having an emission peak at about 600 nm to about 650 nm, wherein said phosphor blend is substantially free of phosphors not falling into one of the four phosphor types of said calcium halophosphor, said blue phosphor, said blue-green phosphor, and said red phosphor; and wherein said lamp having a color rendering index of at least about 85.