Just look at runtime graphs for other lightweight flashlights with too much power, for example the D4V2, even in Muggle mode:
https://budgetlightforum.com/t/-/57232/1187
and here:
https://budgetlightforum.com/t/-/50872/9
Bigger Zebra here:
https://budgetlightforum.com/t/-/54840
Smaller Zebra here:
https://budgetlightforum.com/t/-/43710
Room temp runtimes without the light being held in hand are worse case scenarios. If usage is for a minute or two, then you could probably get away with 500-1000 lumens held in hand. Your hand acts as a thermal bridge to pull heat away.
Zebra flashlights are probably the best at thermal management, in the mechanical design, driver design, and firmware. Our firmware, like Anduril or Anduril2, is general purpose for lots of designs and has limitations based on the driver, LED's, mech design, etc. Zebra probably has about the best runtime graphs of all compact flashlights, meaning highest obtainable output over time.