A sealing profile serves to seal a casing with respect to a cover disk of a lamp. The sealing profile is inserted into a groove on the casing having a groove base. The sealing profile has a seal section which includes lateral contact surfaces and interacts with the cover disk, a connection section and a foot section which is provided with lateral retaining lips and a retaining groove. The foot section has a strip which interacts sealingly with the groove base. When the sealing profile is in the relaxed state, the strip is disposed entirely within the retaining groove. When inserting the sealing profile into the groove the retaining lips are pivoted towards and pressed against the ribs of the lateral surfaces of the connection section, wherein the strip is pressed with a portion of its cross-sectional surface out of the retaining groove into contact with the base.