Lamp

A lamp, comprising:

• a first housing, comprising a first sidewall and a second sidewall, wherein the second sidewall is perpendicularly connected to the first sidewall, and the first sidewall has a first surface and a first assembling tank penetrating through the first surface, and the second sidewall has a first cave;
• a second housing, detachably assembled to the first housing, and having a second cave, wherein the second cave and the first cave form a first opening;
• a bulb base, embedded in the first opening, and assembled to the first housing and the second housing, wherein the bulb base has a base opening and a plurality of slots, and the slots are disposed on an inner sidewall of the base opening along a circular direction of the base opening;
• and
• a positioning part, disposed in the first assembling tank and adapted to move in the first assembling tank along a normal direction of the first surface, and having a first push button and a latch hook, wherein the first push button is disposed in the first assembling tank, an extending direction of the latch hook is perpendicular to the normal direction, and the latch hook is buckled to one of the slots.