After an exhausting session with Victoria's Secret Police, Token
blurted out:

I can not comment on the story of photo-flash carts being used to
defeat any seeker.

OK

I imagine it would work, I see no reason it should
not, but as I am not familiar with the burn times or dispense patterns
of the cartridges I can only guess.

Not surprisingly, you're impression was common back then.

While I can see that photo-flash stuff would be tailored to emit the
most energy in the optical band of interest, it is very hard, some
would say impossible, to design such a device that did not also emit
in unwanted bands.

I just flipped thru my notes from a 1984 course at TAWC, and can't
find the reference. I only got to keep some of them. The course had
guys from every tactical jet in USAFE, TAC, and PACAF. The question
was raised about the effectiveness of photo-flash carts versus IR
missiles during an IRCM lecture.

The short answer was they're ineffective due to the lack of sufficient
coverage of the IR spectrum (not enough heat), plus they're ejected
above and to the side before "blooming" which probably puts them
outside the seeker's centroid (depending on the missile's range from
the RF-4). But not a problem with A-10s' flare dispensers out near the
wingtip.

We watched a couple AVTR clips showing various IRCM techiques against
AIM-9P and L seekers and some foreign made seekers. The tests by the
guys at TAWC concludeded the photo-flash didn't decoy any seekers. And
there were remarks like, "We'd really like to show you some more neat
stuff, but you guys don't have need to know."

Additionally RF-4s had specific IR flares manufactured for their cart
breeches, not simply photo-flash carts modified to bloom early and
burn longer. I know they worked against the AIM-9 from DACT with the
MS or AL ANG.

Still, the point is that flares tailored to work in the IR spectrum
still, very often, possibly even always, emit in the visible spectrum
as well.

No problem.

I had an interesting LOWAT sortie were I tapped an MC-130. I had
gotten a satisfactory weapons check after takeoff (my Lima's seeker
tracked my wingman's exhaust). I managed to trap the MC-130 at my 12
o'clock thru superior airmanship and cunning (okay a single side
offset intercept). When I uncaged the seeker head it literally started
nutating in ever increasing circles and sailed way off the Herc. No
"visible" flares were noted (none on my AVTR), but that Lima just
couldn't lock-on to the Herc's engines. My wingman had the same
experience, and we could track and uncage the seeker against each
other after the Herc engagement. Magic...

Juvat