++2 on the Cygolite.
I use this combo on my commuter bike (I work the graveyard shift so light is very important).

Amazon.com : Cygolite Metro 360/Hotshot 2W Combo Light Set : Bike Headlight Taillight Combinations : Sports & Outdoors

I actually have pair of this combo for a backup and I have never needed it but sometimes it is nice to have 2 front and 2 rear lights.

I find them to be very durable as I commute/ride in the summer heat/humidity 100 degrees + down to 40 below zero with windchill, rain, snow etc.

I suggest a backup because there is nothing worse than riding in the dead of night with no lights.