Patent ID: 8278814
Filing Date: 2012-10-02
Classification: C09K,H01J,H05B

Abstract:
1. A lamp having an improved color quality scale, the lamp comprising a rare earth phosphor layer comprising a phosphor composition excluding halophosphor in said phosphor layer, said composition comprising a first phosphor and a second phosphor, said first phosphor being selected from the group consisting of Y said lamp generating light having delta chroma values for at least two of the 15 (VS −2 to 7 for VS 1; −3 to 7 for VS 2; −7 to 7 for VS 3; −2 to 7 for VS 4; −2 to 14 for VS 5; 1 to 19 for VS 6; 4 to 24 for VS 7; −1 to 15 for VS 8; −2 to 7 for VS 9; −2 to 6 for VS 10; −2 to 6 for VS 11; −1 to 8 for VS 12; −1 to 13 for VS 13; −3 to 13 for VS 14; and −6 to 12 for VS 15, wherein said delta chroma values are measured in the CIE LAB space; wherein when said lamp is energized said lamp exhibits a correlated color temperature of between about 2200 Kelvin to about 3500 Kelvin.