**1) I doubt a bunch of letters would change much.  Stations get those
often. Who are the *sponsors who produce the greatest reaction?  If you're
*changing the channel to avoid a Cereal or Beer, they'd want to know they're
driving customers away ( you don't have to tell a Beer Sponsor that you
don't drink alcohol -- they're still doing 'reverse marketing'  if they're
driving people away).

 2.)  Have you contacted a Local Ep. Association and /or the Ep. Foundation
of America? (efa.org) They'd be a place where they'd already have people
whose job it is to reflect the opinions of members to the (TV) Regulators
who **licence the TV Stations, or major organizations (if it's e.g. one
sponsor producing the most reactions in you).   That car maker just spent
$400 for that 30 second spot, and if you changed the Station (and are 3%? of
the Demographic),  they just wasted that $400 on you.  (If it's the Golf or
Baseball Playoffs, commercials are probably 3-5x above cost. )

  2b.)   When you contact the EFA, you could ask them if anyone has tested
the 'glare screens'  they used to sell for older CRTs on last generation
computers on *TVs, and whether they have reports of if those would work on
Your (one)  TV if you bought one, *and for Your type of Seizures.  They're
intended to cut out Flicker which used to affect people with or without
photosensitivity, but I don't know if they'd help your Type of Sensitivity.
TV stores, Computer stores, and Radio Shack (a computer/CB/Stereo store in
Canada) carry those.   It would mean you'd need one of those per TV you
watch, if you have more than one  (they're about $25.) .

  3)   As above, is it *One sponsor you're reacting to, or predominantly
one Station?   Does your TV have a Remote channel changer?   If it did,
you'd be able to clear out of that channel to another one without the photo
sensitive stuff?  You've probably noticed that those are used to get your
Attention if you're watching e.g. Football, and about to go to the Kitchen
for a Sandwich on the Break,  so they add those Flashers to keep the 'Kids
at the Tube' while they sell their products.

 If you're turning the show to **another channel while you go for lunch,
they've just wasted their money on item 1 above, since you Left their
commercial rather than watching it for them.

**** Who do you write to for MASH or CHEERS ??  They've made that TV show in
1992, and have their cash and are gone.   The TV Station and the Sponsor are
paying for Rights to use the Programs which you're watching.   That's why I
asked if there's a particular group of *Sponsors or *Programs that produce
the effects you're concerned about.
**********
    Mary or others in UK might have a link to any sites over there that are
like the Ep. Foundation of America,  who might explain what they did to get
their local rules changed for TV providers.
 Don't bother with uk.people.support.epilepsy unless you want to spend the
next 3 months pulling Trolls out of your hair.  That group has been inactive
for *5+ Years, so far as I know.

  Oh, and where did you find that Japan and UK?(bottom) have laws about
photosensitivity? If you found that on a Web Search you might also find
links wrt.  what their laws include and how long they've been in place.   If
you find your Local Ep. Association or EFA don't know much about the subject
you could give them links to where it's already in-place and save the 2-3
years start-up if they were to try get the Lawmakers to put rules in-place.

   I don't even know if things like Broadcast rules are National or
State-controlled in U.S.  (They're National in Canada.)  **If they're State
controlled,  that could take Many years to turn that kind of bureaucracy
around in 50 jurisdictions, and would still more quickly be done within an
organization like the Ep. Foundation than one person showing up with a list
of signatures...   Just my opinion.   //

 If people can complain about profanity, which

I have no idea, but you can write to the Federal Communications
Commission, and your federal government representatives, those for your
area and any responsible for broadcasting bureaucracies and public
health. (Surgeon General?) You could also write to the head offices of
the broadcast networks. Signed, snail mail works best.

If you can't find a campaign going, you can always start one with a free
blog.

You could also write to the Directors Guild and to the International
Alliance of Theatrical Stage Employees Head Office (New York, maybe?)
Locals 600 (Cinematographers), 700 (Editors) and 876? (Art Directors).
All represent people responsible for producing the strobing. A set
poorly designed for a critical camera movement can do it when things
like stair bannisters are in the frame, that can implicate the art
directors. A prop that blinks or flashes, has an effect, is made or
provided by someone in IATSE, there's Local 44, but maybe it's regional.
Directors, cinematographers and editors can cause it directly by their
own decisions. Responsibilty in the production industry is spread out
over five or more organisations.

How many broadcast networks are there in the USA? Writing each of them
could be worthwhile, too.

It's really just shoddy work and the producers should have to front the
moeny to keep an eye on it on the set and in post-production. The only
way that would happen is if the broadcast bureaucracy can regulate it.
The industry has been aware of it for a long time and most of the
industry continues to ignore the effect. It's all about costs and it
costs to monitor for the effects, extra measurements and calculations
must be made.

haha, IATSE would probably love it if the producers had to fork over
extra. Any such regulation would mean more work for its membership.