The UNDOUBTEDLY CORRECT answer is:
While travelling at the speed of light, time dilation would approach zero. This means that the headlight switch would take longer than the lifetime of the universe to click from 'off' to 'on'.
Better put the kettle on, mate.
Furthermore, space dilation would make you look a bit thin from the outside. A bit like an anorexic, you'll think yerself as fat as normal in the mirror, but the non-speed of light onlookers will see you contract to a length approaching zero.
TW