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@lot14
As a car driver and ex cyclist, Led lighting is a point source whereas the old style bulbs with a large reflector gave a more general light ( rear light ) I see cyclists in the dark much better if the have a steady not flashing rear light mounted on the the bike not high on the clothing. Although I cannot state this as a fact I would think that most drivers are looking at a height above the ground about the height of most cars rear lights. If you compare the area of a single or three led cycle light to the area of a car rear light then the cycle one is mush less.
Another point to think about is that many years ago when I ws both cycling and driving in central London and other roads in the 30 mph limits most car drivers drove with just the sidelights on not dip beam as is now. The ambient lighting levels are higher now and a small pin point light on a cycle is much harder to see.