Bob Minchin wrote:
Graham. wrote:
On Fri, 29 Jul 2016 19:37:09 -0000 (UTC), Chris
wrote:

On a recent trip back to the UK I noticed - whilst travelling mostly by
rail - that at the landings of flights of steps at very many stations now
there are overhead panels of super-bright blue LEDs tilted downwards
towards passengers approaching the stairs. These panels are *extremely*
bright and quite painful to look directly at, even in daylight. They
appear to be left on day and night.
Does any knowledgeable person know what function they're supposed to
perform?

To discourage intravenous drug use.


How is that meant to work please. No personal experience in such matters....


Blue light makes it much harder to seen veins beneath the skin.

Tim

--
Trolls AND TROLL FEEDERS all go in my kill file