I use a black light (ceiling) in the short hall which serves as an entryway to my theater. The hall is flanked on each side with red curtains except for one place on the wall where I have an APOLLO 13 poster. The poster is framed by plastic light-absorbent stars that glow spectacularly in the black light of the semi-darkened hallway. Also, the hallway floor is lined on each side with the same stars.
In this particular application, lighting up the stars with a black light creates several nice effects. On the floor, the stars illuminate the path, guiding guests into the light-controlled theater. The glowing stars which frame the APOLLO 13 poster greatly enhance its visual impact, emphasizing the dramatic space scene depicted from the film.
So, I think a black light can be quite useful in a home theater environment, when utilized in a way that creates a more cinematic atmosphere.
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