Abstract: The invention relates to a lamp comprising a transparent envelope having a first region defining an enclosed interior volume, and a closure region adjacent said first region, a light source located in said interior volume and electrically coupled to the exterior through said closure region, an interference filter coating formed on the exterior of said first region, said interference filter coating defining a spectral region of transparency, a light absorbing coating formed on the exterior of said first region, wherein said light absorbing coating comprises a ring-shaped portion having a layer thickness of at least 20 nanometer.