To understand the wisdom of dynamo lighting, we might want to look to Germany - where city bikes must legally have dynamo lights pre-installed; much like an automobile has its lights pre-installed.
Dynamo lighting, like car lighting, is integrated. That means no more batteries, no more theft, and highly engineered beams that increase vision and visibility.
If you're a three to four season bicyclist, a dynamo is a highly recommended investment. It involves rebuilding your front wheel with a dynamo hub. This will produce the electricity that powers your night time adventures!