If I found a wad of money in a trunk, I would spend some of it on better lights for bicycle commuting now that Daylight Savings Time is upon us.
DiNotte makes lights that seem (based on my viewing of a few product demos on YouTube) much brigter than you'd expect to get from such a s small package, and they take AA rechargable off-the-shelf batteries, not a specialized, expensive, cumbersome battery pack.
Of course, with his convenience and performance, the cost of the product is well north of the $100 range, which plants it in between most battery-powered head and tail lights and the higher end, higher powered, rechargeable units.
Photos are all from the DiNotte web site (http://www.dinottelighting.com/).
Here are videos posted to YouTube demonstrating the lights and their effectiveness.
Of course, if I had a set of these, the cost of the lights would be more than the cost of the bicycle!