action light_down()
{
set(my,SPOTLIGHT | INVISIBLE | PASSABLE);
my.lightrange = my.skill1;
vec_set(my.pan,vector(0,-90,0));
vec_set(my.red,vector(my.skill2,my.skill3,my.skill4));
}

Should work. Assign it to an entity in your level at the desired position. Set skill1 to desired light range, skill2, 3 and 4 to desired red, green and blue colors.