"Mini/Micro" Weapon Lights?

I got a bit confused reading all that I'd written down about output/runtime before output drops per the lux meter I used (as well as the OEM's rating for Lux, so we can see how they compare, although I trust the OEM more than my Lux meter, it seems very spot on with the claims!). Here it is converted to minutes/seconds, as follows:

Modlite PLHv2, 18650:
-Instant on of 58,XXX Lux (Rated at "approximately" 54,000 Lux).
-At 3 minutes and roughly 20 seconds, 53,XXX Lux, and then it began dropping.
-It ceased dropping at 4 minutes and 30 seconds roughly, and 29,XXX Lux.
-I shut it off at 6 minutes and 15 seconds roughly, with no change from 29,XXX Lux.
-@30 seconds with CR123's: 54,XXX Lux. (No OEM rating given, the presumption is no change)

Cloud Defensive REIN 3.0 Micro (18350):

-Instant on of 102,XXX Lux (Rated at 95,000 Lux).
-Output began drifting a bit until it plummeted starting at roughly 28 seconds, coming to a stop at 1 minute and 10 seconds, roughly, down to 29,XXX Lux.
-At roughly 2 minutes and 50 seconds, I shut the light off, with no degradation from 29,XXX Lux.
-@30 seconds CR123 produced 39,XXX Lux. (No OEM rating given, although "expect performance degradation" is offered as a disclaimer.)

Surefire 340DFT-PRO (18350):

-Instant on of 95,XXX lux (Rated at 95,000 Lux)
-It held steady until roughly 1 minute and 30 seconds, when it drifted down to 47,XXX Lux by 2 minutes and roughly 55 seconds.
-It maintained 47,XXX Lux until shut off at roughly 4 minutes and 35 seconds.
-@30 seconds CR123 produced 51,XXX Lux. (Rated at 55,000 Lux).