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In this link, the complete tutorial for build by yourself (DIY) a spectrophotometer.
This spectrometer can indicate light exposure, flash exposure, CCT, CRI ,Duv, Depth of field, ...
This is a very good project based on AS7341.
It is possible to see spectrum of ligth and chromaticity diagram.
A sekonic spectrometer cost miniumum 1200 Dollards, here you can build it for 70 Dollards !!

http://thierrydphotographe.free.fr/index.php/2025/02/01/spectrometer-light-meter-flash-meter-for-photographer/