Not only useful, but also necessary is the lighting on a bike. Not only the view to the front should be well lit, also the traffic behind you must be informed about your presence. Due to the modern battery rear lights you are much better recognized than with older lights. For this reason, you should ask yourself if the attached lighting is still well recognizable. Modern battery-powered bicycle lights are not comparable to those of ten years ago, as the technical advances for bicycle front and rear lights have not stopped and they have become lighter, more powerful and smaller.