The topeak alienlux tail light is one of the most innovative bicycle lights available with great versatility the alienlux can be fitted to both seatposts and bags to ensure that you39re visible to motorists at night and with an on off mode button concealed in the alien39s head it39s easy to stay safe the topeak alienlux gives off great visibility by 2 super bright red leds with an array of several colours this is a bike light with many uses and has a burn time of up to 100 hours