A: None. They don't have lightbulbs in caves
A: None: Leos are so enthusiastic they carry their own light.
None. They'll just stand in the dark talking about how good the old one was.
Nun.
Seriously who knows? It's pitch black in here.
None, they don't use light bulbs. They live in caves and use no forms of artificial energy because they wouldn't want to be perceived as hypocrites or morons.