Device for emitting light

A light-emitting device for the hardening of substances which harden under the irradiation of light, comprising:

• a light-emitting diode with at least one heat contact surface and at least two electrical connections, whereby heat energy generated during light emission can be dissipated over the heat contact surface, wherein:
• the light-emitting diode is mounted on a first side of a support element, and the support element has at least one recess in an area of the heat contact surface of the light-emitting diode,
• a heat sink primarily positioned on a second side of the support element opposite the first side, wherein the heat sink is heat conductively connected to the heat contact surface of the light-emitting diode through the recess in the support element, and
• a thermistor positioned on the second side of the support element and which is electrically conductively connected to the electrical connections of the light-emitting diode, the thermistor being heat conductively connected to the heat sink and electrically insulated from the heat sink,
• wherein the support element has at least two passages and wherein contact pins of the thermistor are guided through the passages to the electrical connections of the electrical light fixture, and
• wherein the light-emitting diode is designed to emit UV-A light in a wavelength range of 315 to 380 nm.