On Sun, 11 Mar 2018 13:02:39 +0000 (GMT)
"Dave Plowman (News)" wrote:

In article ,
John Rumm wrote:
[...]

Cyclists like to mount them on the front of the bike - mor "eye
catching" than a static light...

Why would you mount a torch to a bike? You want a much wider beam 'to
be seen' than that from a torch.

A lot of the multi-mode LED lamps also have zoom.

Flashing lights on cycles are more down to improving battery life.

They're more noticeable against a background of other lights, when
viewed head-on they appear as movement to which our brains assign a
higher priority. I use a small flashing lamp aimed forwards and a
brighter steady lamp aimed at the road surface ahead, the latter being
easier for other road users to judge position and distance from, as
well as illuminating potholes.