Patent ID: 8764244

Claim:
A module type lighting device comprising: a power supply that includes a case and a circuit board within the case; a frame; and a plurality of light modules provided on the frame, each light module being individually detachable from the frame, each light module including: a base having a first side and a second side, a plurality of through-holes provided on the base to extend in a vertical direction from the first side of the base to the second side of the base, a wall extended from the first side of the base, a light source on the first side of the base and having a light emitting diode (LED) to emit light in a direction away from the base, the light source disposed inside the wall, a sealer provided in the wall, a window coupled to the base with a contact with the sealer and to cover the light source, a cover to cover a circumferential surface of the window, a heat sink having a plurality of cooling fins on the second side of the base, a driving circuit to electrically connect the power supply to each light module, the driving circuit being detachably coupled to the light module or the power supply; and a channel that passes through the base, wherein the light source is electrically connected to the driving circuit through the channel, wherein the driving circuit is a constant-current circuit, wherein the circuit board of the power supply includes an AC-DC converter, wherein the plurality of through-holes are arranged on the base at areas that correspond to spaces between the cooling fins, wherein air flows through spaces via the plurality of through-holes, wherein the plurality of cooling fins includes a first set of cooling fins and a second set of cooling fins, the first set of cooling fins having a lower height than the second set of cooling fins, wherein the driving circuit is provided on the first set of cooling fins, and wherein the driving circuit is provided over the first set of cooling fins without being provided over the second set of cooling fins.