The best description I can give of the light is similar to flood lit football pitch, though probably three or four times the footprint. Not a normal ray of moonlight at all. A very bright 'spot' of white light.
The light, which had no beam of course but only lit up the ground, would move very fast along the ground (at our speed), and light up a factory or two in an estate for 2/3 seconds, for example. Then it disapears for about 10 seconds or so, and reappears lighting up a bend in a road, seeming like a high-speed-train. Quite spectacular really.
I imagine that it is some sort of reflection of the moon, but I have difficulty with some aspects of that theory, namely why the light comes and goes. Also why is it white light (neon-like) and not yellow light, and how come it is so bright? and lastly why is it so unusual?