(The numbers will be updated as I have time to repeat tests & correct errors.)
1. Convoy Headlamp H2 w/ Nichia 219b 4500k: 61%
2. Convoy S21D w/ Nichia 219b 4500k and 519a: 37-40%
3. Convoy M21E, F, and B w/ Getian GT-FC40: 35-37%
4. Nitecore MH12S w/ SST40: 33%
5. Fenix Headlamp HM65R-T w/ SST40: 32%
6. Emisar D4V2 with Nichia 219b 4500k w/ 70° Tmax : 30% (int temp 64° C, ext temp 59° C, cannot hold w/ bare hand)
7. Emisar D4V2 with Nichia 219b 4500k w/ 60° Tmax : 23%
8. Wurkkos TS21 w/ 70° Tmax: 22%
9. Wurkkos TS21 w/ 60° Tmax: 16%
10. Wurkkos TS30S w/ SBT90.2: 16%
11. Coast XPH30R Headlamp: 15%
12. Emisar D4V2 with Nichia 219b w/ 45° Tmax: 14%
13. Wurkkos TS21 w/ 45° Tmax: 8% 
my poor Wurkkos, at least the LED is a gem
Redo test and ranking for final brightness percentage from a Turbo run-down, using ceiling bounce test. Please skip this if you’ve seen it in my other Convoy thread - allow me to double post since I think it’s interesting and don’t want future readers to miss it lol.
Convoy still on top, and 60° C limit didn’t help Anduril lights much. Please note these are small Anduril lights; I don’t have similar larger lights with larger thermal mass. Well the Wurkkos TS30S does have larger thermal mass, but it has that crazy SBT90.2 LED.
I plan to edit/update this list if/when I buy more lights since IMHO it’s such an important parameter for a walk light, where lights are on for long duration. Please note this is a “home test” and values may change if I repeat any test when I’m less lazy 
and find errors. As always, hope this helps.