You didn't mention what floor your sewing room is on, but if it is on the top floor of your house (even with an attic above,) here's an idea. We have a bathroom with no windows and had a tube skylight installed. It wasn't too expensive and it brings in an amazing amount of light. We chose a national brand and had a factory-authorized installer put it in. It has been years now with no problems, no leaks. I still am always trying to turn the light off
