> It looks like LCD panels don't "scale" very well in terms of energy efficiency or power savings over CRT.
Probably true. Much of the power consumed in a CRT is by the deflection coils that scan the electron beam to and fro. That power is proportional to the deflection angle, not the absolute screen size. Most CRTs today have a consistent 110° deflection angle, no matter what the screen size is.
The actual illumination is caused by the electron beam hitting phosphors on the front of the tube, and since only one group of phosphors is targetted at a time this again will not be directly proportional to screen size. Bigger screens may have bigger dots, and require a more powerful beam, but the actual power difference is minor in terms of watts.
LCD TVs, on the other hand, illuminate the whole face of the screen all the time. That is proportional to the square of the screen size (usually given as a diagonal).
So it isn't at all surprising that LCD power consumption scales very non-linearly with size, and is much greater than that of a CRT TV at larger sizes.