Victor Suarez, Bicycle Garage Indy NorthSefas Seat Stay LightVic suggests the Serfas Seat Stay Tail Light for anyone riding after dark.  
"When I started using these lights, cars all of a sudden give me an ENTIRE lane as they pass me on my commute home. Perhaps it's because I look like a freaking Fed Ex jet from behind as I have them both set on the blinking mode. This is a miniscule price to pay for the confidence of PROVEN visability!"
 
Victor Suarez
Bicycle & Fitness Consultant
Bicycle Garage Indy – North
Indianapolis