An artificial dusk is lit only by the flashing lights of the work (if a film's sound is
diegetic if it has a source on - screen, can we use the word for lighting which has its source only in the art to be illumined?).
I don't like musicals except those that are
diegetic (great movies like «Purple Rain», «Saturday Night Fever», «American Graffiti» are naturalistic music driven dramas not fantastical as is the traditional sense of the genre) but saw this as a consolation on the day, so
if you like musicals this might be your cup of tea.