Lighting Scale (nits) from the point on the surface brightness that shines or reflects light. It is luminous intensity in a given direction to a small component of the surface area divided by the orthogonal projection in this area onto a plane at right angles to the direction.

Optic lighting is a measure of the density of luminous per unit area of ??light traveling in a certain direction. It describes the amount of light that passes through or emitted from a particular area, and falls within a given solid angle. The SI unit of luminance Candela is per square meter (cd/m2). The term non-SI per unit is "foolish." CGS unit of luminance is stilb, which is equal to one square centimeter in Candela or kcd/m2 10.

And is often used to describe the lighting emission or reflection from surfaces, flat diffuse. And refers to the amount of light and will be dealt with luminous power of the eye when looking at the surface of a certain angle of view. Lighting and thus an indication of how bright the surface will appear. In this case, the solid angle of interest is the solid angle versus pupil of the eye. Lighting is used in the video industry to describe the brightness of the display screens. A typical computer screen emits between 50 and cd/m2 300. Sun and lighting approximately 1.6 × 109 cd/m2 noon.

Lighting is fixed in optics engineering. This means that for an ideal optical system, and lighting in the lighting output is the same as the input. For real systems, passive, optical, lighting output is at most equal to the input. For example, if you configure demagnified image with the lens, luminous power is concentrated in a small area, and this means that the Photometric highest in the picture. Light in the image plane, however, fills the largest solid angle and the lighting comes out to be the same on the assumption there is no loss in the lens. The image can never be "brighter" than the source.