Lamp

A lamp, comprising:

• a main body comprising a heat sink and a lamp holder located on a bottom of the heat sink, wherein the bottom of the heat sink extends outwardly to form a flange, the lamp holder has a trumpet shaped structure, a bottom of the lamp holder has a shape as an ellipse having a minor axis along a longitudinal direction and a major axis along a transverse direction;
• a lighting assembly mounted to the bottom of the lamp holder;
• a lampshade assembly comprising a cover body covering the lamp holder and a spring located in the cover body, wherein a first end of the cover body resists a top of the flange, a first end of the spring resists a bottom of the flange, a second end of the spring resists a second end of the cover body;
• and
• a reflector cover, wherein a top end of the reflector cover comprises a sleeving portion extending radically and an embedded portion axially extending upward from an inner edge of the sleeving portion, an inner diameter of the embedded portion is less than the major axis of the bottom of the lamp holder, and is greater than the minor axis;
• when assembly, the cover body is moved upwardly relative to the main body to compress the spring, the reflector cover is inclined toward the main body for a determined angle and is moved to sleeve on the lamp holder, until the bottom of the lamp holder is embedded into the sleeving portion of the reflector cover, and then the reflector cover is rotated to a right position, when the cover body is released and subjected to a reversed thrust of the spring, then the cover body moves downwardly to resist the reflector cover, thereby securing the top end of the reflector cover.