I have inserted my LED but it is not illuminating, can you help me?
LEDs are traditionally polarity sensitive. This means that they will only work one way around, not both ways like a standard tungsten/ / halogen bulb. If you have fitted your LED and it is not illuminating, the first thing to try is to remove it, flip it 180, and refit. 99 times out of 100 the LED will the illuminate :)