This new light from Busch & Muller uses a fresnel to spread the light from two LED emitters across a line, giving the light a larger visual footprint and good side visibility. It is the best dynamo tailight I sell and the best I’ve ever used. The Toplight Line only has posts for 50mm rack mounts and the light housing is narrower (just over 90mm) than the other rack mounted tailights though the light source is larger. Like all the dynamo lights I sell, this one has a standlight.