Alright, I now have in my possesion an XL50,100 and 200. At first I couldn't get the 100 to act like the 200. Click it twice quickly for strobe for example. So I put the 200 tailcap on the 100 and viola, the 100 acted like a 200. Hmmmm, but what about the 50? Place an XL200 tailcap on a 50 and you get an XL50 that does all the cool tricks the 200 can do. Want your 100 to be simple hi/lo/strobe, just use an XL 50 tailcap.
Cool.
But how to get that 100 to do the cool tricks the 200 does? Well you line up the "mode" shown on the tailcap vertical and press/hold the button. It prompts into whatever mode you want, be it strobe, sos or which ever. The 200 you just quick click X number of times to get to the mode you want. The XL50 does hi/lo/strobe via quick clicks.
The beam of the 100 I bought is stated to be a bit over 100 lumens (105) and has a whisper of yellow tint. It looks straight up cool white until held side by side with the much whiter 200 (or 50). The hot spot is narrow like old school Maglites. The 200 has a nice broad hot spot. The 50 is somewhere in between.
50 is 200 lumens, beam of 225 m, 12553 cd, 6hr-45min/25 hour runtime, 1m drop.
100 is 105 lumens, beam of 178 m, 7916 cd, 5hr 45min/209 hr runtime, 1m drop.
200 is 230 lumens, beam is 163 m, 6663 cd, 1hr 45min/156 hr runtime, 1m drop.
In real world use all three hardly change beam characteristic when the head is twisted.
All three look virtually the same from across the room. My XL50 and 100 have a hyphon between Mag and Lite. The 200 is one word one the replacement head they sent but has the hyphon on the head that came on the light. I screwed up the factory head trying to put in a glass lens.
The button on the 50 is black, on the 100 is red/orange and gray on the 200. The 80 something lumen 100 tail cap button had a raised area so you could know the orientation of the tailcap mode in darkness. Mine does not have that. So I put a clip on it at the "brightness" portion of the tailcap.
The shade of gray on the 100 is much darker than the 200 I received from Maglite. The XL50's I have are both black.
I may keep the XL50 tailcap on the 100 at work to keep it simple.
Oh, the XL50 does not have the lockout feature of the 100 and 200, at not that I can figure out if it does. Turn light on vertical, turn light down while holding button and when turned off it locks out. Press and hold button vertical again and turn down to unlock. I keep all three of mine twisted loose until power is cut.