Patent ID: 6525460
Filing Date: 2003-02-25
Classification: H01J

Abstract:
A mercury vapor discharge lamp comprising a glass envelope, means for providing a discharge, a discharge-sustaining fill of mercury and an inert gas sealed inside said envelope, and a phosphor-containing layer coated inside said glass envelope, the phosphor blend in said phosphor-containing layer being 40 to 80 weight % of a first phosphor having an emission band with a maximum between 610 nm and 640 nm and having a half-value width of 10 nm to 100 nm, 0 to 20 weight % of a second phosphor having an emission band with a maximum between 620 nm and 660 nm and having a half-value width of 1 nm to 30 nm, 8 to 50 weight % of a third phosphor having an emission band with a maximum between 460 nm and 515 nm and having a half-value width of 50 nm to 120 nm, and 0 to 10 weight % of a fourth phosphor having an emission band with a maximum between 530 nm and 560 nm and having a half-value width of 2 nm to 130 nm, said lamp having an Ra value greater than 96 and a color temperature between 2700 K and 6600 K.