A link to the research paper referenced (http://www.nds.rub.de/media/nds/veroeffentlichungen/2012/07/...) were they explain the methodology including how they had to capture electricity consumption at a higher resolution than the smart meter broadcast and also that the TV had dynamic backlighting. The actual method of predicting usage based on brightness of screen and some of the false positive problems they had is interesting and also the inability to identify some kinds of broadcast (such as tv news) because the picture didn't change enough.