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The average LCD T.V. uses 350W. This meets ENERGY STAR requirements. The average plasma TV uses over 1000watts.
In any case, the question doesn't make sense. Watts is a measure of energy flow NOT an amount of energy. In half an hour a 350w TV uses 630,000 joules of energy. A 750watt TV, or any other 750w appliance, uses the same amount of energy in a quarter of an hour. 350watts means 350 joules per second and it makes no sense to say 350watts/second/halfhour. It is a 350w applicance whether it runs for half and hour or a week. It is always 350watts.
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