Tacx Lumos Road Dropbar Barend Light System HeadLight, Taillight & Directional Set (Both Left & Right). Tacx Lumos Road Dropbar Barend Light System HeadLight, Taillight & Directional Set (Both Left & Right). BE SAFE - BE SEEN !! Unique road bike lights that attached to dropbar-ends incorporates 3 lights in one: Headlight White LED, Taillight Red LED, and flashing Yellow LED (to signal turns), that can be activated by pushing a button ! To be Seen is to be Safe, However, most riders dont like loose or heavy lights. They can now use LED lighting that is connected to the bicycle and also is compact and lightweight ! These lights are mounted inside the handlebar ends at the left and right. Includes Special Batteries ! The Lumos includes an Allen key for adjusting the battery housing in the steering part and 2 AA batteries. These are free of cadmium, mercury and lead !