ugiouyho

There is no such thing as photospectrometry. It's sometimes used when actually meaning spectrophotometry. This usage is incorrect.

spectrophotometry is a branch of spectroscopy dealing with measurement of radiant energy transmitted or reflected by a body as function of wave lenght %

By chemical analysis: Uv-vis absorption spectrophotometry, atomic absorption spectrophotometry, inductively coupled plasma mass spectrometry, inductively coupled plasma emmission spectrometry, polarograhy, phosphorescence fluorometry, flame spectrophotometry, etc.

The term "Spectrophotometry" refers to an instrument that is often used to determine the intensity of the various wavelengths in a spectrum of light. This tool is a part of analytical chemistry.