It may be annoying to drivers but the reality is that a cyclist's vulnerability trumps their annoyance, IMO. If drivers really want to be annoyed, try getting sued for wrongful death, or charged with some level of a homicide or manslaughter for killing a cyclist. And then there are the psychological impacts that come from killing. So my/your increased visibility is to the benefit of both rider and driver. Nobody wants an accident or can afford the consequences.

FWIW, with respect to epileptic seizures, in most states drivers who have epilepsy are required by either their doctor or individually to notify their respective DMV. Usually they have to be seizure free for 6 months to a year to get a drivers license. I think this is very much a peripheral issue and more of a boundary condition.

Based on that, for daylight riding, I use the brightest sharp edged on-off flasher I can find for both front and rear. Right now that's the Bontrager Flare 800 lumen light in front and either the Bontrager flare in back or the Cygolite Hotshot 150. FWIW, the Bontrager Flare R seems to have great optics and does about the same with 60 lumens as the Cygolite does with 150 lumens. Bontrager has a better mount.

J.