I bought a floor-standing lamp with a magnifier years ago at a show. Didn't get on with it. A few years ago, back at the K&S in Ally Pally, I bought an Anglepoise-alike with daylight bulb that clamped to the shelf above the sewing machine. I also found that the orginal floor stand and the post on the new lamp were a match in terms of fitting, so I jettisoned the original lamp assembly and, at the moment, the new lamp is on the old stand behind the sofa so it shines over my shoulder. I don't really need it in the sewing room because that faces east and gets a lot of morning light, and because I'm disinclined these days to do machine work in the evening. Hand sewing in front of the telly is fine.
Long story short, yes, have one, and it's really useful for close work during the dark days and evenings.