Not all LED lights have the same design. Over time, the luminous flux of all lights decreases but unlike incandescent bulbs, instead of burning out, light emitting diodes lose their brightness after thousands of hours. It is considered that the lifetime of LED lights ends when it reaches 70% of its original luminous flux. High-quality LED lights can serve from – 50,000-100,000 hours. The exact lifetime of LEDs depends on several factors. The heat is generated in the LED module and if it is not properly distributed, the lifetime of the light emitting diodes and the quality of the light will be shortened. Manufacturers of the quality lighting develop solutions and components that efficiently distribute the heat that accumulates in the critical point of the light. Some manufacturers ‘induce a current – and overwork’ the LEDs at the initial stage of use (one of the signs can be a low lm/W value, for example 100-120 lm/W), which leads to a higher brightness at the beginning, but a shorter lifetime, as well as changes in the light temperature (after a short time the light becomes greener or bluer). Manufacturers who claim that their LED lights will serve for 100,000 hours can only be partially correct because they usually trust the laboratory tests that are carried out on the LED module but not on the entire LED system.