What is the best way to conserve energy during night time hours?

Hello.  Is it best to put the iMac into Sleep mode or Shutdown mode during night time hours in order to conserve energy?  Thanks for any guidance on this.  I normally just put it to Sleep but wonder if this is the best way?  Thanks. 

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Here are the figures for a new iMac 21.5 inch:
It could be argued that if everyone in the world with an iMac saved the 0.93 W (1.36 - 0.43) by turning the iMac off rather than sleeping it, there would be a big saving. But if an individual wanted to save energy, a better approach would be to turn a light bulb off or turn the heating down by a degree.

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