Posted By jonr on 23 Jun 2014 10:39 AM
Do a google search for "Screw-In Motion Sensing Light Socket". Such sensors detect movement, so a fixed position heat source isn't a problem.
I'm aware of these. They are not quite what I want as they hang down in a place with already limited clearance (my basement). I want a new light socket with the sensor built into it. I can't find one and it surprises me.