I obtained a quite good result (for my needs), but I still cannot notice any
difference in using "albedo"...

Here is the code:

#version 3.7;
global_settings { assumed_gamma 1.0 }
#default{ finish { ambient 0.0 diffuse 0.0 } }

background {rgb 0.5*<1,1,1>}

// camera ------------------------------------------------------------------
  camera {angle 20    // natural view
  location  <0,0,0>
  right     x*image_width/image_height
  look_at   <0,0,1>
  translate <0,0,-250>}

//--------------------------------------------------------------------------
//---------------------------- objects in scene ----------------------------
//--------------------------------------------------------------------------

#declare diffusor = material {
  texture {
    pigment { rgbt <1,1,1, 0.08> }
    finish {
      ambient 0.4
      specular 0.0
      reflection { 0.0 }
      diffuse albedo 0.1,0.9
      crand 0.8
    }
  }
}

// Light source
sphere {<0,0,0> 1 pigment { rgb <1,1,1> } finish {emission 2} no_shadow }
light_source {
    <0,0,0>
    color 3000*<1,1,1>
    fade_distance 1
    fade_power 2
}

// Diffusor object
#declare box_size = 50;
box { <-box_size/2,-box_size/2,0>,<box_size/2,box_size/2,0.1> translate
<25,0,-20>   material { diffusor } }

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