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.
Interactive Joke of the Day Mug
Coffee Mug
Camenbert
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.