A light attachment for fastening to a carrier structure including a light source (4), a battery (5) and a light source controlling switch (23) comprising a casing (1) with a front side and a rear side and including a head portion (16) with a first opening (17) for the light source (4) in the front side and an elongated body portion with a second opening for a switch actuating arm in the front side and further comprising a removable elastic sleeve (6) for surrounding at least partially the elongated body and the carrier structure to urge and fasten the rear side of the casing (1) to the carrier structure.