I haven't had a need for the switch, but I can think of situations where it would be needed. I have replaced original incandescent bulb with a 4000K LED, which has sufficient brightness. Bbut still the left side of the items in the boot remain dark. Therefore I have got parts to add another light on the left hand side, and at the same time I will replace the original one with the one with a switch, which is fully plug in replacement.