INTELLIGENT SENSOR TECHNOLOGY significantly reduces energy consumption within LG TV products according to independent testing results announced today.
TÜV SÜD found that LG LCD TVs sensor technology dramatically reduce the amount of power consumed – up to 69.5 percent less than standard models.
The sensor technology works by analysing the amount of ambient light in a room and adjusting the TV's settings accordingly in order to gain picture perfection.
George Mead, marketing manager for digital display at LG Electronics explains that, “The intelligent sensor is one of the best results of our ongoing efforts to create eco-friendly products that offer the same or even better quality than conventional TV products."
Some LG TVs are also registered with the Energy Saving Trust’s Energy Saving Recommended (ESR) scheme which means the TVs must meet strict criteria on energy efficiency.
These findings have also been confirmed by the Korea Electric Testing Institution and the Centre for Electrical Power Information and Technology Studies at the University of Indonesia.
Intelligent Sensor technology is available on LG’s LCD TV models LG5000, LG Scarlet (LG6000/LG6100) and LG7000. µ
I had this in my TV 10 years ago.

It had a sensor and it adjusted the brightness according to lighting. Eco is IN again.
putting a product out there that actually works first. I've had 2 LG 50" plasma TVs become "unrepairable" in the last 2 years, the second within 6 months of coming out of the box.

Thankfully my new replacement didn't have to be a LG so I've got a nice shiny Samsung lCD instead....and you know what - it works!
So the TV in a dark room uses 69.5 percent less than standard models with the brightness cranked to 100%. 

How much would it save if the "Standard Model" is adjusted correctly for the same light level? 

I just love the "independent tests" where they pay for the answer they want to see.