HOW MANY NURSES DOES IT TAKE TO CHANGE A LIGHTBULB? ONLY ONE. BUT SHE NEEDS A DOCTOR'S ORDER. AND SHE'S NOT ALLOWED TO DIAGNOSE THAT THE LIGHTBULB IS OUT AND NEEDS TO BE CHANGED. SHE CAN ONLY NOTIFY THE DOCTOR THAT THERE IS NO LONGER ANY LIGHT EMITTING FROM THE BULB AND WAIT FOR FURTHER INSTRUCTIONS.