Carbon fiber is very strong, but also very brittle I believe. There's a good reason why you'll probably never see a CF clip on a flashlight.
As for a flashlight that uses carbon fiber, there are a couple, but the one that comes first to mind is the Atlas C57 which was a Kickstarter project a couple years back. Cool little 18650-based flashlight, although it was backed I don't think it ever really took off.
Lumintop's Prince series also uses carbon fiber? That might be what you're looking for.