I've been so busy trying to learn the basics of linux tty, that I forgot to follow up on this project.
Someone asked about a CFL-spectrum and here it is:
I don't have a reference spectrum to compare with, but my 532nm laser pointer gives a peak at around 1250 pixels, so I guess the peaks at 1350 pixels is the 542.4 nm terbium line and 546.5 nm mercury line.
I took the liberty of zoomin in:
The "lines" are a bit round, so I guess I could do a better job with the focusing.
Next week in the universe. Tests with the spectral lamps at work..