These light, at least where I live, are mainly not meant for planes, but helicopters. For example, Military SAR / police / medical helicopters fly very low to

These light, at least where I live, are mainly not meant for planes, but helicopters. For example, Military SAR / police / medical helicopters fly very low to the ground in cities. They often fly on sight, below any legal flight limit. Urban structures are all they need to avoid, and sometimes they must fly very close to them. As it's very hard to see a tall, unlighted structure at night before it's too late, this would be very difficult without any kind of signal lights from the structure itself.