no need for dimmers if you use corner lighting. Ikea has paper column style standing lamps. they have switches that sit on the floor and just a step turns them on. place in the corners the shed low diffused light. they can also act as sound treatments in the corners as well. nice trick.
=> http://www.ikea.com/us/en/catalog/products/30232225
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=> http://www.ikea.com/us/en/catalog/products/30232225
.