It also seems that you're not specifying a light color in your light_source
block, only a pigment for your looks_like container.
#macro added and tweaked.
Should be (mostly) good.

#version 3.8;
global_settings {assumed_gamma 1.0}
#default {finish {ambient 0.07 emission 0 diffuse 0.85}}

camera {
  perspective
  location  <0, 4, -4>
  look_at   <0, 0,  0>
  right     x*image_width/image_height
  angle 67
}

#macro msrgb (vec, mult)
 srgb <vec.x*mult, vec.y*mult, vec.z*mult>
#end


#declare TEMP_COLOR = srgb <.5,.3,.7>;

light_source {
  0*x
 msrgb (<0.5, 0.3, 0.7>, 50)
  looks_like {
   sphere {0, 0.1
    texture {
     pigment {rgb 1}
     finish {ambient 0 emission 1 diffuse 0}
    }
   }
  }
  fade_distance 0.1
  fade_power 2.0
  translate 2*y
}

plane {y, 0 pigment {srgb .5}}

// objects
#declare SC = seed(34);
#for(i,1,15)
cylinder{0, 1*y,.2
pigment{srgb <.3 + .7*rand(SC),.3 + .7*rand(SC),.3 + .7*rand(SC)>}
translate 2*x
rotate i*360/15*y
}
#end

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