A lamp structure including a lamp housing, and a circular ring piece, a lamp
holder,
and a lamp locking-collar all assembled in the lamp housing sequentially. The lamp
housing has holes on a surface for extending a wire through and has a stepped portion
on an inner wall. The circular ring piece is placed in the lamp housing supported
and fixed by the stepped portion. The lamp holder has a space for receiving a lamp
bulb, and a protrusion on an external periphery engaging a notch provided on an
adjustable compressible portion when the lamp holder is mounted. The lamp holder
abuts against and is fixed on the circular ring piece. The lamp locking-collar
and the lamp housing both have grooves for an elongated member (spring). The lamp
locking-collar has gaskets for a waterproof seal.
