Look, I found this for you:
http://www.nhtsa.gov/cars/problems/e...tml#EVALUATION
Now, obviously, if a light is right directly in your field of vision that's better than if it's up, down, or to the side. But the most important aspect of the third light is that it's
different to your mind. And btw, those six LEDs will put out over 33,000mcd of luminous intensity.