I have a set of Bell Radians, I think I got both for $20 or less. they are USB rechargeable and last a long time with the onboard battery. The taillight is great on flash mode to increase visibility. The headlight leaves something to be desired in terms of throwing light for me to see when it's totally dark, but it works better as a strobe to increase my visibity to other drivers.

the key is, do you want the headlight to make it easy for you to SEE or BE SEEN? if you just want to be seen, than any cheap reasonably light strobe will work great. if you want to see the road clearly, you should invest in something with several hundred lumens.