Force iMac Display to Sleep?

in Genius Bar edited January 2014
Well, since there isn't a button on the display... is there a program or hack out there that will turn it off?

I often leave my computer on overnight for rendering. The application constantly refreshes a preview window, so the energy saver and screen saver don't take effect because there is activity. It takes like eight hours every night, seems wasteful of energy and the display life.
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