A few weeks ago, I smelled smoke in our family room. I looked around and found nothing. There was no smoke, just a smell. This happened a couple mornings for about an hour, then would go away. On the third day, I came in from the shop to get a drink, and this time there was actual smoke. No fire just smoke. It was coming from my wife’s area where she sits and stitches her cross stitch projects. She uses a lighted magnifying glass on a stand. The way it was standing, sunlight coming in through the window was focused on some books next to her chair. Fortunately, there was no real fire but it did burn several of her books but nothing else. I’m just happy that I was at home and caught it before there was actual fire!
This reminded me of another incident. A few years ago I was at a friends shop that had the same thing happen to his DeWalt saw. He had a magnifying light mounted to his saw sitting in front of a window. Sunlight from the window shining through the magnifier melted all the plastic on his saw! So, this is a warning, if you use a lighted magnifier, make sure it does not sit next to a window!