What lights to buy to upgrade older S21A and M21B?

[QReciprocity42 (efficacy ≠ efficiency)]

@Bort

Someone with more math ability than me could create a throw calculator where you choose the LED, throw in the reflector size, smooth or Orange peel and get a throw number output.

There is a nice easy formula to estimate achievable throw for a smooth reflector, see item (3) this post:

New Astrolux MF06 flashlight; SBT90.2, 46950 battery, Buck Driver(!) and (supposedly) 2126 meters of throw.

Very nice analysis! A lot of the specs raise serious eyebrows, and this test of the SBT90.2 gives everyone enough information to see what is off. (1) 65A turbo. The test shows the SBT90.2 completely maxxed out by 30A (under optimal thermal conditions!), so I’m curious to see how the hell they can push double that through the emitter, and what happens to the emitter when that is done. (2) 6800lm. The bare emitter doesn’t even touch 6000lm; factoring in a typical optical loss of 15% in a reflect…

Unfortunately OP is very difficult because (1) different OP reflectors have different levels of OP, and (2) the same OP reflector diffuses different LEDs by different amounts.