Given the IF22A is in the ~$30-40 range:
Convoy S16, M21B, M21C, and L21B with CULPM1 or SFT-40 use buck drivers. Also C8+ and M21A, not buck but still better than FET regulation. Also the Z1. Probably a couple others I’m forgetting.
Noctigon DM11 uses a CC driver so heat-wise it’s similar but it will achieve a higher output on lower battery. Also the Noctigon KR1 and Emisar D1.
The Sofirn C8L throws a little less but is brighter and has great regulation with the boost driver.
The Amutorch XT45 and XT35 Are like $43 if you can swing the extra couple bucks.
And of course if you can stretch an extra ~$10-15, or keep an eye out for sales, there’s more, better options that I’d argue offer better value, but that’s not your original question.
Not talking about thermal stepdown, yea, every light does step down from heat eventually.
What I mean by that is a boost, buck, or CC driver can achieve a higher output on a lower battery than a FET driver. As an example, you can see here the Noctigon KR1 with SFT-40 and CC driver achieves very close to max output when the battery is at 3.8v, whereas with the IF22A, max output tracks downward linearly with cell voltage.
That is interesting. People use lights all kind of different ways! The way you describe your IF22A usage, I can see the regulation not being a huge deal - and you’re likely not the only one with that use case. In fact I often use throwers similarly to you, but I personally think having the max output/throw available even if I’ve been using the light for a while or don’t have a full battery is an extremely valuable feature, especially on something like a pocket thrower. Others don’t seem to care about that as much - to each their own.
Oops, you’re right, I brain farted and was thinking about 3v LEDs.