The LEDs are not being connected to the power source directly, they are at least connected with a resistor to limit the current and drop the voltage... most of the LED light bulbs are using some kind of circuitry that also includes an electrolythic capacitor(s), which are not taking the high current strobbing too lightly and may malfunction (leak or short within itself), as a result, passing undesired 12V voltage (most LEDs are 5V) onto the LED itself which may result in the murder of the LED...

I did not think that anyone needed the lecture on the operation of the semiconductors but since folks are asking... lol...