Abstract: A barrel adjustment and retaining assembly includes a barrel body having an end surface, a seat body having a protrusion, a limiting component and an adjustment barrel. The seat body is movable relative to the barrel body. The protrusion is moved toward the end surface when the seat body moves from a pre-assembly position to an assembly position. The limiting component is clamped between the protrusion and the end surface to deform such that an outer diameter of the limiting component is increased when the seat body moves from the pre-assembly position to the assembly position. The adjustment barrel is sleeved slidably on the barrel body. The clamped limiting component is confined within a hole portion of the adjustment barrel.

Abstract: A barrel adjustment and retaining assembly includes a barrel body having an end surface, a seat body having a protrusion, a limiting component and an adjustment barrel. The seat body is movable relative to the barrel body. The protrusion is moved toward the end surface when the seat body moves from a pre-assembly position to an assembly position. The limiting component is clamped between the protrusion and the end surface to deform such that an outer diameter of the limiting component is increased when the seat body moves from the pre-assembly position to the assembly position. The adjustment barrel is sleeved slidably on the barrel body. The clamped limiting component is confined within a hole portion of the adjustment barrel.

Abstract: A lighting device includes a main body having a bottom portion, two lateral portions extending upwardly and respectively from two opposite ends of the bottom portion toward each other, and a connecting tube formed on the bottom portion and located between the lateral portions. The connecting tube has one end that faces a rear end of the main body and that is open for communicating the connecting tube with the outside of the main body and for insertion of a lamp post therein. A light emitting module is disposed on the main body and includes a plurality of light emitting elements. An electrical box is fixed to a front end of the main body and housing a circuit module that is electrically connected to the light emitting elements.