For commuting I use Niterider USB-rechargeable lights, Lumina 700 front and Solas rear. They are now several years old and are totally reliable (and extremely bright). The USB feature is terrific. They have newer versions out now that are even brighter. Highly recommended. Beware of the cheap blinkie lights that are around. They look fine in the store but many of them are not bright enough to be seen easily by car drivers approaching from behind.