Another test whether the PLab spectrometer 3.0 can achieve reproducible data curves.
This time I took a CFL (because of the nice narrow light bands in the spectrum) and put it 2 meters away from the spectrometer to avoid over-exposure. Dark room (not what you think!) with no stray light. Spectra taken between 12:54 pm and 14:58 pm, roughly in 10 minute intervals. I put the curves together in a gif animation that you can see here:
As you will notice, there are intensity differences between the captures but the main peak wavelengths are pretty stable. Best seen at the red curve peak to the right.
All 10 pictures are calibrated using the same curve. If you want to check the CSVs the spectra are saved under the names "Reproducibility test CFL #" (1 to 10).
The lamp was a "Corso CTU 20W" with a very bright but annoyingly flickering light.
PS: if you can't see the gif animation try IrfanView.