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
I agree with the solar tube idea if you have a roof over the room. I also try to turn out the light every time I walk through. It doesn't give off heat either.