Benefits: Maintenance-free! Lamp/bulb life is over 50, 000 hours (when used 24 hours, 7days per week) before anticipated degradation - that's over 5 ears! Maintains adequate LUX readings even in large sizes [36" and up] An engraved diffusion pattern distributes light across the panel so that your graphics are slightly brighter in the center Distributes light from the edge: No hot and cold spots on your graphics Easy-to-use, "snap-open" frames for easy graphics changes Low energy consumption Cons: Higher initial cost than either CCFL or T5 lightboxes For larger sizes, there are limits to illuminating power of bulbs preventing super high brightness in the center of the box. Powered by innovative LED technology, this light box offers bright, With tiny LED bulbs built into the sides of the frame, each slim light box illuminates your translucent graphics to create a stunning visual display with no hot or cold spots. A unique diffusion pattern in the frame ensures that all you see is bright, shadow-free illumination, even in very large sizes. With a "snap-open" border on the frame, this slim light box is also very functional. You can change your graphics with little effort without even removing the panel from the wall. Although it initially costs more than a traditional light panel, this slim light box has many benefits that help outweigh its expense. Because LED bulbs are smaller and more efficient than fluorescent bulbs, this light box display is thinner and will actually save you money in the long run (in electricity bills). Each LED light box also has a life span of over 50, 000 hours when used 24 hours, 7 days per week. That means you won't have to worry about changing your bulbs or replacing your slim light box for over 5 years! Because of its long life span, an LED light box makes a great permanent fixture in airports, malls and stadiums. A3 Dimensions: Outside dimensions: 15" x 21" x1. 2" Graphic size of image: 12" x 18" Viewable area: 11 3/8" x 17 3/8" (a portion of your graphics lays beneath the snap-open frame) Average Luminance between 1750 and 2000 LUX