If you mean energy efficient I think bicycle powered TV is the way to go:
It’s a lot of work but we could conserve energy while tackling the growing obesity epidemic in the U.S. We might even be able to prevent millions of dollars of future medical expenses by pedaling off the pounds with powering the TV as an incentive. This is something that people are seriously discussing and trying to make possible. There’s a great video on youtube demonstrating this and you can get a gist of the pros, cons, and suggestions for improvement by following the comments people have left. http://www.youtube.com/watch?v=WvEK4I5HGz4
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