Patent ID: 7239071

Claim:
A fluorescent lamp comprising: (A) a glass tube; and (B) a fluorescent particle layer, formed on an inner surface of the glass tube, having a fluorescent particle mixture of blue light emitting fluorescent particles, red light emitting fluorescent particles, and green light emitting fluorescent particles, wherein said fluorescent particle mixture is selected from the group consisting of BaMgAl 10 O 17 :Eu//BaMgAl 10 O 17 :Eu, Mn//YVO 4 :Eu and BaMgAl 10 O 17 :Eu//BaMgAl 10 O 17 :Eu, Mn; LaPo 4 :Ce, Tb//YVO 4 :Eu, wherein the blue light emitting fluorescent particles have an average specific gravity of 4.0±0.4, wherein the red light emitting fluorescent particles have an average specific gravity of 4.0±0.4, wherein the green light emitting fluorescent particles have an average specific gravity of 4.0±0.4, and wherein the fluorescent particle mixture forming the fluorescent particle layer has a specific gravity of 4.0±0.4.