LED 3.5x The new 1511 Mobilux series of illuminated hand-held magnifiers features LED illumination with many new benefits! SMD LED (light emitting diode) illumination provides an alternative light source preferred by many patients due to its distinctly whiter spectrum and longer useful life. In addition to the bulbs offering nearly unlimited life (50,000 hours!), the batteries last 5 times as long as when used with incandescent bulbs! These features provide lower usage costs and make the magnifiers even easier to use! To soften the color of the light small yellow filters are included which can be snapped-on over the LED bulbs to provide an illumination option.