While a secondary location is certainly doable, I think another way to look at things would be to also make your primary sewing room a bit more inviting. If it is in your budget (and there are some very inexpensive ways to go here), and look at LED track lighting. The older I get the more I can appreciate a room that is 'as bright as the sun' as my hubby would say.
I, too, am building a sewing room down in the basement with few windows, and the "rule" for hubby is....there is no such thing as TOO MUCH LIGHT!
I am sure you will find the best solution to your lifestyle. Good luck!