And don't be tempted to save money and buy one of those cheap, similar looking lamps on eBay for 1/2 to 1/3rd the price of the Aven lamp above. They're chinese crap! Save your money and buy the lamp from AvenTools.com
I needed a second lamp for a second desk, and trying to save money, bought a clone look-alike from eBay.
Bad move.
The Magnifying Glass suffers from distortion, a *VERY NARROW* angle field of view, fringing of the edges, the only thing that works is the "lamp" part. But the magnifying performance is a total, utter piece of chinese crap. Even after just a few minutes of looking into it, it will give you headaches.
On the Aven lamp, I can work 8 hours a day looking through it and not get a headache.