Just a follow up on the Fibre Flare, it sucks, the light did indeed die after a couple of months. I also lost the receipt and never got a chance to take it back. It is incapable of keeping rain out, it is very flimsy, the battery terminals rusted quickly and the on/off buttons are tiny and ping off never to be found again.
It's a toy and never should never be used for commuting. I emailed the company and never received a reply, the email was polite with what I thought was helpful suggestions in beefing the light up, no reply. A real shame.