AA and AAA style lights are declining rapidly in availability, and with only 35 lumens with the Serfas you would have the dimmest tail light on the road. You should reconsider what you want. You could buy a Philips Saferide 80 headlight that uses AA bats, and then buy a small roll of tail light lens tape and cover the clear lens with 2 to 4 layers of the tape (test each layer till you get the redness you want). Then you would have the brightest AA battery powered tail light on the market.