The present disclosure provides a lamp. The lamp includes a lamp holder including a first shell and a light source module, where the first shell includes a first inner chamber and a through hole which is in communication with the first inner chamber, and the light source module is movably disposed in the first inner chamber, and at least part of the light source module extends out of the first inner chamber or retracts into the first chamber through the through hole. The lamp further includes a support column and a lamp base, where the first shell is supported on the lamp base through the support column.