The electric lamp has a quartz glass lamp vessel (1) in which a light source (2) is accomodated. The lamp vessel is covered by an interference film (5) which has layers of alternatingly silica (51) and a material (52) of relatively high refractive index. A silica containing adhesive layer (53) is in between the lamp vessel (1) and the film (5). The adhesive layer has a content of boron oxide and/or phosphorus oxide.
