Patent ID: 8373338

Claim:
A lamp which when energized exhibits a correlated color temperature of between about 3000 kelvin to about 4500 kelvin and having an improved color quality scale, the lamp comprising: at least one light-emitting element having a light emission when energized; and wherein when said lamp is energized said lamp generates light with a total light emission having delta chroma values as follows: at least two color samples of the CQS are within the parameters −5 to 2 for VS1; −2 to 5 for VS2; −5 to 0 for VS3; at least one color sample of the CQS is within the parameters −2.5 to 8 for VS4; −2 to 15 for VS5; at least two color samples of the CQS are within the parameters 0 to 21 for VS6; 3 to 22 for VS7; 2 to 7 for VS8; at least two color samples of the CQS are within the parameters −6 to 5.5 for VS9; −4 to 5 for VS10; −4 to 2 for VS11; at least one color sample of the CQS is within the parameters −0.5 to 5 for VS12; 1 to 12 for VS13; and at least one color sample of the CQS is within the parameters −7 to 4 for VS14; −7 to 7 for VS15; wherein said delta chroma values are measured in the CIE LAB space; with the proviso that the lamp does not comprise an incandescent light-emitting element, wherein the lamp is a low pressure mercury vapor discharge lamp optionally supplemented by one or more of OLED and LED, and wherein said at least one light-emitting element is phosphor.