Look at the antennae.
The males have big feathery-looking antennae.
The females have long skinny antennae.
Trap and cage a female. She's giving off pheromones/perfumes to attract mating males.
They search for the scent direction with the 2 big receptor antennae.
Seems weird for mostly nocturnal insects to be so attracted to the light.
Why not fly in daytime? Birds?