+1000000000

If you have less than awe-inspiring lights, get some Dinottes or maybe a Magicshine. My Dinottes were the best thing I bought for my bikes.

For just over $200 you can get both the Dinotte Red Rear light that takes 4 AA batteries:

http://store.dinottelighting.com/sha...t=products.asp

and Amber lights which are even visible during the day:

http://store.dinottelighting.com/sha...t=products.asp

Should come out to about $240. But well worth it. BTW, one complaint I have with these lights is the battery pack for the AAs are really really cheap, they break quite easily. Dinotte knows this so they give you an extra pack. It's like a $100 light with a 0.25 cent pack. I wish there was a more sturdier AA pack option. Also, they use a 9-Volt type connector to link the pack to the light. I am afraid that the connector will wear out by connecting and reconnecting all the time. You should use some electrical tape to ensure that it doesn't shift around and get detached when you ride which can deform the connectors.