If you are serious about riding after dark, invest in a good headlight and tail light.

I highly recommend Lights and Motion lamps, and currently use L&M's Seca Ultra model. It is not inexpensive; however, it's reliable, efficient, has three levels, plus a flash mode. I found that I can see well on low, even riding on unlit trails. Battery life, particularly on low setting, is incredible. The battery is not heavy and during the winter, I noticed no decrease in run times even below freezing. The Seca's handlebar attachment is super easy to use, too, and the lamp easily switches between bikes. In addition to a handlebar mount, you can mount it on your helmet. The battery recharges quickly, too. By the way, L&M products are made in the USA!

If you don't want to spend that much, L&M makes the Stella lamp which is more economically priced. I haven't tried it yet, but based on my experience with L&M lamps (I used to use their ARC-LiOn lamps before upgrading to the Seca), I would recommend the Stella. When my backup lamp goes, I probably will get a Stella.

L&M's website is www.bikelights.com