I had some early santa items..as well has me cordless angle grinder..which I've always wanted one...love it....I got this cap before Xmas.
..it was from homebase..I had seen them before but the price of £12 turned me away ...but hey its Christmas I thought...get those early treats in....
They are called power cap and they have discreet led lights under the peak...click of a hidden switch and the led lights shine your way in the dark..
I've found it very handy not having to carry a torch and it came with spare batteries..might get the beanie version next time