Just for interest I compared with Petzl head torches which I've used for <ahem> "a number of years"
My most powerful to date is a Myo XP - 85 lumens max (150 on "boost") and TBH I usually ratchet that down for sake of the battery life AND put the diffuser on, and that's when I'm running on rough surfaces.
The most powerful Petzl Ultra head torch - 350 lumens, they claim 120 mtr beam.
Obviously it depends on the width of the beam but on that basis 1600 lumens is out to about 250 mtrs with a spot beam, or as you say you really are going to light up a "whole field".