Fun fact to know:

The realistic range for the "specular" and "phong" parameters is /not/ 
limited to 0..1.

Instead, for a polished material, a value of

     specular 0.25 * ((1/ROUGHNESS)+1) * REFLECTION

or

     phong 0.5 * (PHONG_SIZE + 1) * REFLECTION

is actually realistic, e.g.

     finish {
       reflection { 0.2 }
       specular 50.05
       roughness 0.001
     }

or

     finish {
       reflection { 0.2 }
       phong 100.1
       phong_size 1000
     }


BTW there's also a similar law goverining the "diffuse" parameter: If 
you set "brilliance" to anything but 1, you should set "diffuse" to a 
maximum of

     diffuse 0.5 * (BRILLIANCE + 1)

which would correspond to a diffuse reflection of 100%.

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