My 600+ lumens easily overcomes even the brightest strobes. The only time I use a strobe is when I'm approaching a dangerous intersection and I want cars to notice me. Otherwise, riding with a strobe actually diminishes my ability to see. Those bright taillights (e.g. Dinottes) should be shut off on MUPs (unless, of course, you are so slow you are worried about being run down by faster bike riders).