In message , at 05:33:55 on Wed, 18
Mar 2015, john james remarked:

We aren't looking for picture brightness altering second by second.
More from one shot to another.

Trouble is that when you don't know when the shots change,

You do, because you are monitoring all the channels.

I've never been into analogies, they don't help with the question
of whether its actually possible to work out what someone is watching
on two TVs given the data that can be obtained from a smart meter.

The analogy is the other way round, if you can monitor the TVs, you can
also monitor the fridge/freezer.
--
Roland Perry