Michael and PP, 
Quick test: I loaded a model exported from MoI into UV Mapper and it was bright white. I checked the material settings in UV Mapper and specular was showing RGB 255, 255, 255. I changed this to 0, 0, 0 and the over-bright condition was fixed. The model was now what I would consider to be normally bright. I then exported the model from UV Mapper. This is the comparison of the mtl files:
 
MoI:
 
newmtl 507c 
Ka 0.0000 0.0000 0.0000 
Kd 0.7725 0.7922 0.8039 
Ks 1.0000 1.0000 1.0000 
Tf 0.0000 0.0000 0.0000 
d 1.0000 
Ns 0
 
UV Mapper once specular value is changed:
 
newmtl 507c 
Ka 0.000000 0.000000 0.000000 
Kd 0.772500 0.792200 0.803900 
Ks 0.000000 0.000000 0.000000 
Ns 0.000000 
Ni 1.000000 
illum 2 
d 1.000000
 
The web reference at  http://local.wasp.uwa.edu.au/~pbourke/dataformats/mtl/ says "The Ks statement specifies the specular reflectivity using RGB values".
 
I'm thinking that maybe the Ks is having an impact on how reflective the material is and how bright it looks?
 
Mark  
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