The power socket sparked
The LED switch power is fully inserted before the power socket with a spark. the users who worried about electricity safely problems .all right, in order to know that problem of power spark.

we will take the work process from there。

First the 110V AC have come as power supply, first by Rectification with diode, then the 110V changed into 155V（110*1.414≈155V）by filter capacitor。In order to ensure the output power stable，choice capacitor should choose capacity of course big, in here we got to the root of the sparked problem. Namely the capacity will need stocked a lot of electric energy. then the plug connections has created sparked. This is all part of the power input mode.
But then insert again within seconds., the spark disappears. in a words the charge and discharge of capacitor, the energy process of electric spark..