How does this compare to a 10w halogen? I interchange 3 NR TR 2.0. At some point all the batteries are going to have to be replaced. Not unhappy w/t system, but have been thinking of investing in a dyno hub. Does it include a taillight as an option?

Oh, and more on point I got my wife a Shimano 6 sp 'Mega-range' freewheel-34x14, PC-870 chain, Shimano Tourney Mega-range Deraileur, Cygo-Lite 2x6 12w double HL and a gel seat. Needless to say she loves the gel seat. The whole drivetrain is amazingly smooth.