Here is an example of setting some light paramters.

add light
name Light0
diffuse 1.000000 1.000000 1.000000 1.000000
specular 1.000000 1.000000 1.000000 1.000000
ambient 0.100000 0.100000 0.100000 0.100000
light constant 1.000000
light linear 0.100000
light quadratic 0.000000
light ltype 1
light cutoff 60.000000
light spot 0.000000 0.000000 -1.000000