Be predictable
Light your bike (or yourself) the same way vehicles do: White goes in front, red goes in back. LED “blinky” lights that use re-chargeable AA or AAA batteries are light, inexpensive, and do a great job of making cyclists visible. However, these lights may not do a good job of illuminating darkened roads or bike paths. If you need a light that brightens the route ahead of you, look for the new generation of high-power LED lights, powered by rechargeable NIMH batteries.