Devil 49's post describes what is pretty much a standard practice but as in everything Wires will kill you in an instant and even the very best ground crew can make a mistake in the dark while under stress to get the aircraft down on. the ground.
I used all of the lights on the aircraft including the Night Sun....angled it down like a landing light and widened the beam to be more of a flood light.....and tried to fly down the light in a slow steep approach.
On takeoff I pointed the Night Sun upwards and flew up the light beam again looking for wires.
As dependable as turbine engine are today my primary concern at night landing at Scenes was wires and not an engine failure.
All my EMS flying was done in Twins but before NVG's so White Light...bright white light was welcome.
Also....I required the Med Crew to devote their full attention to looking for obstructions and wires during landing in order to have three sets of eyes looking outside.
It was not unusual to get out and do a ground recon when possible.