these already exist. They are called reversing lights. I'm yet to see a car without them. Maybe you are saying that reversing lights should be brighter. I don't no if this is really an issue with cars currently. I'm always able to see enough when I am backing up.

I've got to agree with pedalpete. It's a fix for a problem that doesn't exist.

NOt necessary anymore due to the usue of real-time video cameras for reversing. These cameras can even be low level infra-red which gives a daylight equivalent picture. Great for parking at night, and of course mounted on the front allows drivers to see objects not normally visible in low and no light conditions. Some OEMs already have such features avaialble as options on some of the higher range cars. Check with your local dealer.