Light probs... again...

I don''t think I understand the opengl-light-model correctly. [list] [*] How can I set the radius of the light [*] How can I set the stuph to light up [/list] I''ve got the basics working however, somehow I cant figure out the above. The normals get calculated like :

float Ax, Ay, Az;
float Bx, By, Bz;
float Cx, Cy, Cz;
float l;
for(long i=0;i<this->LevelWidth;i++)
 for(long j=0;j<this->LevelHeight;j++)
  {
     Ax = x1;
     Ay = y1;
     Az = z1;
     Bx = x2 - x1;                
     By = y2 - y1;
     Bz = z2 - z1;
     Cx=Ay*Bz - By*Az;
     Cy=Az*Bx - Bz*Ax;
     Cz=Ax*By - Bx*Ay;
     l = (float)sqrt(Cx*Cx + Cy*Cy + Cz*Cz);
     this->Normals[i+j*this->LevelWidth].x += Cx / l;
     this->Normals[i+j*this->LevelWidth].y += Cy / l;
     this->Normals[i+j*this->LevelWidth].z += Cy / l;
}
[/CODE]

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