Patent ID: 8278814

Claim:
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 2 O 3 :Eu; Gd(Zn,Mg)B 5 O 10 :Ce,Mn, or combinations thereof, and said second phosphor being selected from the group consisting of (Ba,Sr,Ca)MgAl 10 O 17 :Eu 2+ ,Mn 2+ ; LaPO 4 :Ce,Tb;(Ce,Tb)MgAl 11 O 19 ; and (Ce,Tb)(Mg,Mn)Al 11 O 19 , or, combinations thereof; said lamp generating light having delta chroma values for at least two of the 15 (VS 1-15 ) color samples of the color quality scale within the following parameters −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.