LAMP FOR GENERATING COLORED LIGHT

摘要

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 a nd electrically coupled to the exterior through said closure region, an interference filter coating formed on the exterior of said first region, said interference filter coatin g 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.