Is there an adaptor to screw into an
existing flood light so the cam+ screws in
to the fixture?
Welcome to the Forum, @stayl1953! 
How could you rephrase your question? I’m not sure what you’re trying to ask, because Cam Plus is a service and not a product. What is it that you’re trying to accomplish?
Never mind - Amazon answered - E26 Light Bulb Socket Extender