The FV-2010 Plus Film Viewer features LEDs with pure white light, providing a very uniform luminance, and have a theoretical life expectancy of 50,000 hours! The LEDs generate significantly less heat than conventional lamps, and use much less electricity, making the FV-2010 Plus more eco-friendly. The FV-2010 Plus uses a low voltage / constant current power supply specifically designed to extend the life of LEDs. Instead of multiple hardware masks, the FV-2010 Plus has 6 push button selectable windows (plus one hardware mask to limit the window height to 2.7″ (69mm).