Did PWM affect LED service time?

The PWM(pulse width modules ) is one of the primary regulate light way. it is only not easy to achieve , it is import thing that user can control currently of led. but also have a lot user worried about it’s hurt to led . That is impossible, i know you don’t believe me, but I can prove it to you. please see information as follows:

To obtain the prerequisite, the big junction temperature(Overlarge heat stress may destroy the led  service time) is necessary and high frequency of led PWM 。on the contrary, the led e layer to form a larger thermal stress; layer to form a larger thermal stress,
you may rest assured use it in adjusted light circuit.