Patent ID: 8727587

Claim:
A controllable on/off device for an auxiliary light comprising: a lamp module having a body in which a driving unit is disposed and connects with an illuminating element, the body including a first conducting piece for conducting electricity fixed on a bottom surface thereof and coupling with a cathode contact point of the driving unit, and a second conducting piece secured on the bottom surface thereof and coupling with a negative contact point of the driving unit; a base fixed under the lamp module and including a conduction element corresponding to the first conducting piece and the second conducting piece and having an electric conductivity; a pivotal clutch mechanism defined between the lamp module and the base so that the lamp module is axially rotated and shifted between a first rotating range and a second rotating range and drives the lamp module to move upwardly and downwardly, such that the first conducting piece and the second conducting piece of the lamp module are driven to contact with or leave from the conduction element, thus turning on or off the illuminating element.