Yoshimura makes the best one for the Ninja 250 IMHO, and it can be found on eBay for under $100. Has a nice bright LED plate light.
No the light is not that bright, it's a combination of the camera flash and me washing out my plate numbers.
I have come to terms with the possibility of dying while riding, life has a 100% death rate. I would rather live having fun and end up dead in a motorcycle crash than never do anything fun because it's dangerous and I might get killed. No one makes it out alive anyway. - From a friend on another forum, used with his permission.