chrisb71

http://ibiblio.org/rdu/DRLs/studies.htm

http://www.bmj.com/content/328/7444/857.full

edit: Every study says lights help, there are simply no studies saying how much light helps. While certainly there is probably a dropoff in effectiveness depending on how bright the light is, what is that dropoff? What amount of lumens do you need to still be effective? A blanket statement like "bike lights won't work" is not based on any science.