My wife has meniere's disease, which results in debilitating vertigo attacks. At this point the balance sensors in one of her ears are essentially totally destroyed, and those in the other are slowly degrading.
One of the results is that her vision is now a much bigger part of here balance system. Anything that disrupts it can trigger vertigo attacks.
The flickering of arc lamps and many fluorescent lights causes these attacks. (For instance, she can't spend more than about 20 minutes total in a "warehouse store" such as Costco, Lowe's, Home Depot, etc. because of their use of arc lights (with substantial regions of the store on a single phase). We have to turn off the tube-style kitchen lights
120 Hz flicker is well above the "flicker fusion rate", so you can't perceive it. We believe the attacks occur because the strobing causes slight delays and errors in the apparent position of objects when they are, or she is, moving.
Some compact fluorescents trigger attacks, some do not. (We believe this to be because, on those that don't phosphor persistence or adequate filter capacitors after the rectifiers "fill in" the "valleys" of the post-rectifier waveform, reducing flicker until it's not a problem, while cheaper lights skimp on capacitors, allowing the light to strobe.)
LEDs are good for flicker rates into the GHz. Some of those we have examined flicker quite dramatically. So we will be very cagey about switching to them, until they're both efficient AND the manufacturers have begun making a practice of supplying enough capacitor filtering to avoid significant flicker.
Incandescents, of course, don't have the issue. They heat up and cool down very slowly "filling in the valleys" just fine.
When this regulation came along, though, we were concerned that we would soon be unable to purchase replacements for burned out incandescents in our Nevada home, which would have been a serious health problem if non-flickering replacements were not available.
So we purchased enough current production bulbs for each of the fixtures to last for the remainder of our expected lifespans.
This cost about a thousand bucks, so far. (We still need to buy the replacements for the "can" fixtures over one of the minor countertops, and some more "daylight" ceiling fan bulbs. Probably another $400 by the time we're done.)
We really didn't want to do this, preferring to buy replacements as needed and switching to LEDs in about another three years IF flicker-free devices become available. But the new regulation created enough of a risk to force us into it.
Now that we've bought them, we'll probably continue to use them long after we'd have switched to LEDs.
So in our case the unintended consequences were quite the opposite of what was intended.