I have an external display on my iMac and I would like to work only on the external display and turn off/disable the iMac one, just like the "clamshell mode" on a Macbook for example. It works with Windows in Bootcamp, but not in the Mac's partition. The iMac's display is too shiny and it gives me headaches when I work while the sun is shining.
How can I turn off the iMac's screen so it won't stress my graphic card, display etc.?