Pattern 12 is a prismatic panel with a 3/16″ diamond base female conical prism. The LI-12 offers maximum efficiency with excellent direct glare control, which has been considered the standard in the industry for many years. Pattern 12 is well known as THE “Standard Lens”. Used in almost everything in the lighting industry from the lay-in troffer fixtures to ceiling grid applications as well as used in the manufacturing of wrap lenses.