"GB" wrote in message
...
On 02/03/2016 15:30, NY wrote:

Actually this would not necessarily be a good idea. Sometimes it is
better to have constant illumination of the road ahead from lots of
lights dotted along the road, rather than rely on lights projecting
forwards from you car, which illuminate by inverse square law:

Does inverse square apply to a directed beam of light? You could have
multiple light sources on the car, each highly directional.


Hmmm. You *may* have a point there. My knowledge of optics isn't good enough
to know.