We just received 15 SEM3 (Like TIR3) lights. 6 went immediately, so I gotta say these are selling fast. Replace the rear reflector and hardware to the brake light. Check you local laws to make sure it is allowed.
http://www.youtube.com/watch?v=WR-gZ9ERFT0
http://www.texascyclechrome.com/sem3ledlightred.aspx