What I want to do
I wanted to follow up on this post with a couple screenshots of an attempted calibration I just tried, based on a tube fluorescent that doesn't have as many spectral lines as a compact fluorescent bulb. This seems very related to @cfastie's Twin Peaks post about uncertainties in the double green line in CFL spectra.
My attempt and results
I took a spectrum of a tube fluorescent bulb of the kind shown in the lead image, found in suspension ceilings, and I tried calibrating it two times; first, aligning the left green peak from the reference (G1) with the single green peak in my spectrum.
Next, I tried aligning the right green peak from the reference (G2) with the single green peak in my spectrum:
Questions and next steps
I'm not sure which is correct, but I calibrated using a CFL, and although my slightly battered spectrometer is not in peak (haha) condition, my calibration clearly shows two green peaks. The result shows the single green from the tube bulb at ~547nm, or clearly lined up with the second, G2 green line.
Here's a set of them overlaid:
Why I'm interested
I'd guess that these long tubes lack a lot of the phosphors found in "warmer" CFLs, and that this single green peak is likely to be a mercury peak, leaving the other to be a phosphor like terbium, perhaps. I know this conflicts with one of the theories in @cfastie's Twin Peaks post, and am eager to hear his thoughts on it!
Sorry, I realized I should've added one more thing. If what I'm hypothesizing above is correct, and the long tube fluorescents show the ~546nm second G2 green line, then they are suitable for calibration with the new Spectral Workbench 2 calibration system, as we use the G2 line as our second calibration point.