Originally Posted by ItsJustMe

Up front, if you need them to see by, a headlight off eBay. $30 or so and many, many lumens. Be gentle with the wiring, almost all of the less expensive lights have wiring that's not super tough. Also note that the battery pack is NOT waterproof on any of the cheap lights - use a plastic bag, opening facing down, or stash it in something else waterproof

For self-contained and waterproof, go to eBay and look up "ultrafire wf-501b" - I have two of these and they work well. $20 for light, two batteries and a charger typically. Also search "flashlight handlebar" and get a mount. I find medium is bright enough on these lights almost all of the time and that gives more than an hour per battery per charge.

In the back, I think it's best to spend about $35. If you like Knog, the Blinder 4V is one I like, but all the Knogs have a drawback - they mount on the seatpost, period. If that works for you, great, otherwise, look elsewhere. The Cygolite Hotshot is good, the PDW Danger Zone or Radbot 1000 are all excellent lights and all < $40. You won't go wrong with any of them.