Sorry for the delay, bros.
If you're still interested on a cheap spectrometer you can easily build one yourself or get a DIY kit. The spectrum pics are taken with your smartphone cam but you can also get kits based on an arduino webcam. The better ones cost up to 100 bucks for the cheapest solution you only need an empty DVD(to get a 1000 grit diffraction grating) and some cardboard.
Later, upload the photos you made to their website where they will be evaluated and displayed in a corresponding SPD chart, including all required measurements.
I really like this Lego kit... reminds me somehow on my childhood, lol! 85$
https://store.publiclab.org/products/lego-spectrometer-kit?variant=7468634308636