This 3 diopter magnifying lamp features a bright 2 x 13w Daylight light (140w equiv.), a super large 7.5x 7” XR lens, and the new Free-Motion Head-Joint™. These new features make this lamp not only extremely strong but also surprisingly easy to position and use. XR technology makes the lens 50% lighter, extra resistant, and easy to clean. The new head-joint guarantees precise and smooth positioning of your lamp without constantly having to tighten the wing-nut. This lamp also includes an electronic ballast so you can work longer in comfortable light, and it has the Clip-on Lens System™ so you can increase the magnification in seconds without any tools. UL® Listed