Zero. They don't exist.
None, we just swap out your whole house
None. They'll just stand in the dark talking about how good the old one was.
Twelve. Three to Physically Change the Bulb, Three to Talk About How Complicated it Was and Six to Call themselves Electricians.
Just one. But he has to check it 100 times one for each watt.
Nobody has ever seen them directly, but everyone says they exist.
You take it to the Moo-seum. I know this joke is terrible, but I totally came up with it on my own, but I'm sure it exists already.
Boo Bees
A sheet in the dark!