None, PETA can't change anything.
The answer may shock you.
Twelve. Three to Physically Change the Bulb, Three to Talk About How Complicated it Was and Six to Call themselves Electricians.
That's impossible, because they can't climb the ladder.
One to unscrew it, and one to hold the ladder.
Uh...standby I'll check on that.
Two. One to hold the bulb, and one to drink until the room starts spinning.
Nothing. He's a positron.
Doesn't matter. They'll just nerf darkness next patch instead.
None. PETA can't change anything.