I just got my paper spectrometer and it works very well! This is the spectrum from an LED flashlight. When I analyzed the spectrum, I see the expected peak at 450 nm and another peak at about 540, but there is a dip at about 570-580 nm - there is no yellow, as you can see. I checked the spectrum with another spectrometer and looks normal, so I think the problem is my camera, an iPhone SE. Does anyone know if this camera is set to filter out yellow? Otherwise does the DVD diffraction grating filter yellow?
Update: I just looked through the other spectra posted that are tagged as white LED and they all look similar to mine, with 3 peaks instead of 2 that I expected. So I think that means the DVD is filtering some wavelengths.
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