sentences:  The harmonic limit check performed in line with class C–lighting equipment, IEC 61000-3-2 requirements is evaluated for different LED setups.Compared to other lighting systems LEDs must be kept cool as high temperatures can cause premature failure and reduced light output.Thermal management of high-power LEDs is required to keep the junction temperature of the LED device close to ambient temperature, since increased temperature will cause increased current, more heating, more current, and so on until failure.