The LED is anticipated to last a very long time, almost the lifetime of the car. In the rare case where the headlight no longer works, $400 is quite reasonable taking into account other cars. For example, Acura's LED headlights are like 4 times more.
In one of my old cars, the HID bulb was like $200, but at lease it was a straight-forward replacement, no need to take a whole bunch of parts off the car and re-align the headlight after replacement.