thanks for the link!

I've wondered about making a "be seen" headlight of this type for my bikes, and this does help identify the important characteristics....

(a) The rate of modulation shall be 240 <plus-minus> 40 cycles per minute.
(b) The headlamp shall be operated at maximum power for 50 to 70 percent of each cycle.
(c) The lowest intensity at any test point shall be not less than 17 percent of the maximum intensity measured at the same point.


in essence, the modulator just dims the light slightly, and at a 4Hz rate. Compared to some flashing bike lights I've seen, it's enough to be noticed without being annoying. Very nice!


Steve in Peoria