I voted for Nichia / 3 mode / no memory.
Always start in low so the user doesn’t accidentally blast their eyeballs with full power in the dark. Then medium, then high.
Mode levels: 15lm, 50lm, 200lm for reasonably equal spacing.
No strobe. I refused to buy the current F2 because of the strobe.
Nichia 219B: 5000K 90+ CRI for neutral white and good colour rendition.
I’ve noticed that most “ordinary users” prefer higher colour temperatures because they “look brighter”. Very few people like my warm white lights, but the cold white lights don’t come in 90+ CRI. 5000K is a good compromise for the 2xAA “ordinary user” target market.
If you make a new F2 like this, I’ll buy a couple for myself and more as gifts.