A few weeks ago my Light and Motion Vega 200 rubber strap broke. Light and Motion support sent me a new one when I contacted them and provided a proof of purchase.
But I say this is confusing, they would not warranty the strap without the receipt. But why then does Light and Motion ask you to register your product online at this page: http://bikelightingsystem.com/support/register-your-light.html
They even go on about it in this blog entry: http://bikelightingsystem.com/blog-news.html
I got a new part but was miffed that I had to dig up the receipt for a light that I had registered on line.