Recycling a wall dimmer lightswitch for a projector?

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hello, there is a house going to be knocked down nearby, and it has some of those lightswitch knobs on it that you can turn to adjust the light to any level.

these are made for 240v 100-300w useage, do you think i can easily just fasten one to the light wires in my 400w OHP to have onboard brightness level?
 
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