Aircraft LED light unit (1, 10) comprising: at least one printed circuit board (2, 2-1-2-4) which comprises at least one metal core layer and at least one dielectric layer, at least one LED (3, 3-1-3-3, 3-111-3-43n) disposed on the printed circuit board (2, 2-1-2-4) and which comprises an anode and a cathode for electrically coupling to a power source, wherein one of the anode and cathode (31, 32) of the at least one LED is electrically connected to an electrical conductor which is disposed on the dielectric layer and is coupled to a first terminal of the power source, wherein the dielectric layer electrically isolates the electrical conductor from the metal core layer, the other one of the anode and cathode (31, 32) of the at least one LED is electrically connected to the metal core layer of the at least one printed circuit board, wherein the metal core layer is coupled to a second terminal of the power source; the LED light unit is an exterior aircraft LED light unit, which is at least one of a projector light, a flood light, a taxi light, a landing light, a runway turnoff light, a head light, and a search light; a first soldering material is arranged between the one of the anode and cathode (31, 32) of the at least one LED and the electrical conductor, and a second soldering material is arranged between the other one of the anode and cathode (31, 32) of the at least one LED and the metal core layer, wherein the second soldering material is arranged in an opening of the dielectric layer in which the metal core layer is not covered by the dielectric layer, and wherein the second soldering material has, in a direction perpendicular to the printed circuit board, a greater extension between the printed circuit board and the LED than the first soldering material. at least one printed circuit board (2, 2-1-2-4) which comprises at least one metal core layer and at least one dielectric layer, at least one LED (3, 3-1-3-3, 3-111-3-43n) disposed on the printed circuit board (2, 2-1-2-4) and which comprises an anode and a cathode for electrically coupling to a power source, wherein one of the anode and cathode (31, 32) of the at least one LED is electrically connected to an electrical conductor which is disposed on the dielectric layer and is coupled to a first terminal of the power source, wherein the dielectric layer electrically isolates the electrical conductor from the metal core layer, the other one of the anode and cathode (31, 32) of the at least one LED is electrically connected to the metal core layer of the at least one printed circuit board, wherein the metal core layer is coupled to a second terminal of the power source; the LED light unit is an exterior aircraft LED light unit, which is at least one of a projector light, a flood light, a taxi light, a landing light, a runway turnoff light, a head light, and a search light; a first soldering material is arranged between the one of the anode and cathode (31, 32) of the at least one LED and the electrical conductor, and a second soldering material is arranged between the other one of the anode and cathode (31, 32) of the at least one LED and the metal core layer, wherein the second soldering material is arranged in an opening of the dielectric layer in which the metal core layer is not covered by the dielectric layer, and wherein the second soldering material has, in a direction perpendicular to the printed circuit board, a greater extension between the printed circuit board and the LED than the first soldering material.