An LED lamp includes a housing and a light source located outside the housing. An electric module is received in the housing. The housing defines a receiving recess in an outer surface thereof. The light source is connected to the electric module electrically. The light source is pivotally mounted to the housing and pivotable between a rest state and a working state to adjust an illumination angle of the light source. When the light source is located at the rest state, the light source is received in the receiving recess. When the light source is located at the working state, the light source is pivoted up from the receiving recess. The LED lamp can be used for normal illumination, emergency illumination or mobile illumination.