Oh that must be a different flash pattern specific to the Metro.

*edit* I looked at the Cygolite website. On Expilion lights, the DayFlash mode I described above is a "special" mode that is accessed by pressing and holding the power button. On the Metro lights, DayFlash is one of the normal modes that you get to by just going through the modes - it's after the SteadyPulse mode that's meant to be used at night (keeps the light on and pulsates every couple of seconds). If you press and hold the button you get to the one special mode for walking, which is lower than the lowest regular setting.