Independent Consumer group Which? say their researchers have seen a dramatic decrease in TV power consumption in 2009, particularly from brands like LG. The 42″ LH2000 is in the current batch of TVs being tested at the Which? lab and has received full marks for its green credentials:

The 40-inch Sony WE5, a model marketed as an Eco TV, also fared very well in our power consumption tests and boasts a range of ‘Eco’ features, but it didn’t quite score as well in our energy efficiency tests as its larger, LG counterpart.

Both models typically use around 90 watts when switched on (the Sony model uses slightly more than the LG model), which is around half that of the average 40-inch models tested over the last two years. When set to their highest power saving modes, the energy consumption of the Sony WE5 drops to just over 60 watts, while the LG LH2000 model reduces its power consumption by less than half to around 41 watts.

Both models feature ‘hard’ off switches to ensure that they don’t drain any power when switched off, and both models have a screen blanking option, which darkens the screen when listening to a radio station. In the screen blanking mode, the Sony WE5 consumed 48 watts, while the LG dropped its consumption as low as 16.3 watts.

The full Which? review of the LH2000 will go live later this week.