It definitely not any floodlight and it is definitely not isolated to night-time. Our only outdoor lights are 2 ~3W LEDs that are always on at night.
Obviously, it is something on a strict timer (i.e. has some brains in it!) and 38W are definitely more than any typical electronic gadgets use (most are on TP-link sensors anyway). Why would it wake up every hour for a few seconds twice, 1 minute apart? And what is it doing?
I’ll do more research…
So looking at the quoted device library, we do have a Dyson charger so this 38W thing looks quite similar (ours is a V11, though). I’ll put in on a Kasa plug.