Reminds me of summer camp where we'd practice morse code flashing from across a little lake, maybe 200m shore to shore at the points we used. Of course the lights back then were all dim halogens and any strobe was entirely manual.
Closest I’ve come to that was when I lived in a condo complex years ago and there was a pool below mine. Some jerkoffs were yelling and making all this noise one night at like 1 AM so I held my Nitecore TM26 (this was a long time ago) out the window and blasted them with 4,000+ lumens on turbo for like 5 seconds. It was pitch dark - fully open pupils I’m sure.
They were all shouting “WTF was that??!!!”
Lucky for them I hadn’t bought my Imalent MS18 yet (: