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About your question; I've been using a Jewelers Lamp since before I really needed one. Most are equipped with a 4" 3.5 X magnifier lens. The fact that there is a light under the head that puts the beam right where I need it was the deciding factor for me. The one pictured below was purchased at a Home Depot store for 29.99.
I use a 40 watt spot light type bulb in mine and it works for both tying and photographing flies at the vise. It also lights the bench top so that all materials are easy to spot while working. When I lived down east I found the lamps handy when tying dries or nymphs down to size 20 or smaller. The magnifier made it possible to get great detail on even the smallest of dries.