I have a Very Large, Brightly Lit tail light on the Back of My Rear Rack..

The bar end lights I have seen are 1 led and No Fresnel lens over it to make it appear any larger .

I wear Hi-Viz clothing, My Neon Lime Parka is Made with lots of reflective tape on the back and sleeves


You Probably see those in England, though Mine does Not Have the word' Police 'on the back..