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.
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Stalagmice !
They're always picking on him.
Is there a terrorist mobile tariff I can go on
He is in a cave. How does he even see the signal Why won't you just text him
A: None. They don't have lightbulbs in caves
A. They both look out their caves and see rubble.
Echosystems. From my 9 year-old.