Luminous flux, luminous intensity, luminance and co. - when is which quantity used and how can they be compared?

NIR spectra very rarely have clearly distinguishable peaks that correlate unambiguously with the composition of a sample. However, thanks to chemometric methods such as PCA, PCR and PLS, clear signals can also be extracted in the NIR range.

Scattering effects can significantly complicate the evaluation of NIR spectra. Preprocessing steps such as MSC or SNV help here.

365 nm or 395 nm - which wavelength is better to identify amber?

What's the matter with concerns about 5G radiation? How does it compare to other radiation sources?

Which colors are in the rainbow - and why can we see them?

Why metamerism exists and how Isaac Newton accidently discovered it over 300 years ago.