Source : Webster's Revised Unabridged Dictionary (1913)

Photometrician \Pho*tom`e*tri"cian\, Photometrist
\Pho*tom"e*trist\, n.
   A specialist in photometry.

Photometrician \Pho*tom`e*tri"cian\, n.
   One engaged in the scientific measurement of light.

Source : WordNet®

photometrician
     n : someone who  practices photometry [syn: {photometrist}]