Patti - I had chairs just like yours when we lived in New Hampshire & Milwaukee. Left them with the house in Milwaukee as we were moving ourselves & saved on weight as much as possible! They sure were comfortable! Table was round with 2 leaves. How 'bout yours?
I used to do something quite similar to your lightbox, only I used a pull out storm window I took out those 2 leaves from the table. I put a lamp on the floor. I have the same lamp you are using, next to the sewing machine! What I really want is that bendable attachable little light they make for machines, but is so expensive. I think Amazon.com has them for cheaper. Need to check.