Integral multilayer optical film

An integral multilayer optical construction comprising:

• opposing first and second structured major surfaces comprising substantially regular two-dimensional arrays of respective first and second structures arranged thereacross;
• and
• first and a second optical diffusers disposed on, and substantially conforming to, the respective first and second structured major surfaces so that each of the first and second optical diffusers has a substantially constant thickness, wherein each of the first and second optical diffusers has an optical haze of greater than about 2% for at least one visible wavelength in a visible wavelength range extending from about 420 nm to about 680 nm,
• such that when the optical construction is disposed on a substantially Lambertian light source with one of the first and second structured major surfaces facing the Lambertian light source, light emitted by the Lambertian light source is transmitted by the optical construction with a cross-section of an angular luminous distribution of the transmitted light in at least one first plane that comprises a normal to the optical construction, comprising first and second intensity peaks at respective first and second angles on opposite sides of the normal, wherein the multilayer optical construction has an integral construction;
• wherein in the at least one first plane, the angular luminous distribution of the transmitted light has a global maximum that makes an angle of greater than about 20 degrees with the normal and a global minimum that makes an angle of less than about 10 degrees with the normal.