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I did a power check of some various flat-screens:
Philips 50" LCD 2006- 448 watts steady
Panasonic 42" Plasma 2004 - 220 watts varies
Panasonic 37" LCD 2009- 64 watts steady
Samsung 50" LED 2010- in progress
Based on what LED does for exterior lighting energy use versus metal halide and high-pressure sodium, I expect it to be low.
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