Originally Posted by
zen_
Without knowing anything more, I recommend the Cygolite Dice 50 + Dice 150 pair to start. The Dice rear is the only light you'll ever need for that, and the front one is nice as a day light, low power night, helmet, or lightweight backup. I wish I had just got those to start years ago instead of cheaper lights that sucked, got ruined by water, or stopped charging.
Ehh...I disagree with this recommendation. I had a Dice 50 and found the battery life to be very poor - esp after a couple years of light use. And 50 lumens is not much for daytime use. As for the headlight: 150 lumens is pretty weak -- not bright enough to be highly visible in daylight, and not bright enough to see well at night.
A Cygolite tail light with at least 100lm is a good starting point, and a headlight with at least 400lm is a good all purpose choice.