A light module comprises a light unit, a heat transferring plate or a plurality of heat transferring pipes, and a plurality of heat dissipating fins. The heat transferring plate or heat transferring pipes are positioned on the bottom surface of the light unit to transfer heat generated by the light unit. When the heat transferring plate is used, the heat dissipating fins are arranged under the heat transferring plate and perpendicular to the bottom surface of the heat transferring plate. The heat dissipating fins have a recess for the accommodation of the heat transferring plate and the light unit. When the heat transferring pipes are used, the heat dissipating fins each contact the heat transferring pipes. Uniform heat dissipation is thus attained.