It could be the light itself, it is electronically controlled.
I had mine factory installed but from what I remember seeing on the net theres a PC board that the lights are attached to and chips that control them. If the tub is new, I believe the LED has a shorter warranty than the rest of the tub - call the dealer. If the tub is older - buy a regular bulb, put it in and see if you have any problems ... if you don't then buy another LED light if you want one.