On 27 July, 23:28, SMS wrote:
someone wrote:
No because it would never be as bright as the mid-day summer sun and
the flashing from the wheel rim can be made more conspicuous
(interupted flash) when the bike is struck by direct sunlight.

LOL, okay, then in the summer, on clear days, in the middle of the day,
you can use something else to make yourself conspicuous. The rest of the
time, which is most of the time, keep a flasher going. But be sure it's
a flasher that's actually visible in daylight, not a drugstore variety
LED flasher.

The best option is from here
"http://www.night-sun.com/htmldocs/stuff_civilian.html". I use something
similar with my 12 volt system,
"http://www.allelectronics.com/make-a-store/item/STROBE-3A/AMBER-XENON..."

A xenon strobe is a much better rear light than an LED flasher because
it is less directional, though there are now a few higher end LED tail
lights that have side pointing LEDs.

They also have these in clear, blue, green, and red. A clear one for the
front would be a good daytime flasher for the front.

Sometimes I might agree with you but for the fact that I've survived
without any daytime lights, and the times I have been struck, the
invisibility cloak took charge because of what I believe is a lack of
apparent threat or movement. I believe that although the flash may
attract the attention of a driver for a split second, it is not long
enough for him to assess the probability of another road user. He
will still look through the cyclist because he is small and apparently
immobile. A pair of alternating lights to the front and to the rear
would likely have greatest effect (there are legality issues with this
due to it being used by police etc.) Using leg bands does seem to
have prevented the smidsy scenario with me. I've stiched 4" white
collars below my knees on my black tights. I also move from side to
side to improve conspicuity when safe and desirable.