I have been commuting by bicycle for six years. And I had installed generator lighting systems on all of my bicycles. Never had a light stolen off of my bicycle. Even when I worked late shifts in downtown Seattle with crackheads wondering around.

6 years hey bravo, you're getting there...

Could somebody steal it if they wanted to? Certainly. But that doesn't mean they will.[/QUOTE]

You have been lucky (or your dynamos aren't considered sexy enough to steal, crackheads steal for resale value), and your story is but an anecdote, statistically speaking, things left on bicycles get stolen very frequently.