Is your TV using twice as much power as advertised?

TVs could be detecting official tests and powering down in order to gain a better energy efficiency rank and higher sales, US energy campaigners are warning. When exposed to real world conditions, the same TVs can double their advertised power consumption, they say. They also shut off energy saving features without warning and block users from turning them back on. This may be adding an estimated $1.2 billion to US consumer energy bills over product lifetimes.