Patent ID: 7839068

Claim:
A fluorescent lamp including a visible radiation and/or UV-radiation transmissive discharge vessel having inner and outer surface areas, at least one luminescent layer applied onto the inner surface area of the discharge vessel for converting UV-radiation to wavelengths of UV-A, UV-B and/or visible radiation, the fluorescent lamp comprising: at least one substrate layer applied on the outer surface area of said discharge vessel, said substrate layer comprises at least one volatile organic material being releasable over an extended time period by UV-radiation and/or thermal heat generated from said fluorescent lamp, wherein at operation the temperature of the outer surface of the discharge vessel of said fluorescent lamp is ≦100° C., and wherein the discharge vessel further comprises: at least one first section having the inner surface area coated with the luminescent layer and the outer surface area not coated with the substrate layer; and at least one second section having the inner surface area not coated with the luminescent layer and the outer surface area coated with the substrate layer.