Albedo

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In Gamestudio

Albedo is a value ranging from -100 to 200 and determines the influence of the sun light. If at -100, the material does not reflect sun light at all, regardless of static shadows. Between 0 and 100 the amount of sunlight reflection depends on the brightness of the shadow map below the entity. At 200 the sunlight is reflected fully regardless of static shadows.

Scientifically

The albedo of an object is the extent to which it diffusely reflects light from the sun. It is therefore a more specific form of the term reflectivity. It is a unitless measure indicative of a surface's or body's diffuse reflectivity. The word is derived from Latin albedo "whiteness", in turn from albus "white". The range of possible values is from 0 (dark) to 1 (bright).