###Calibrating on the [SpectralWorkbench.org](https://spectralworkbench.org) website### You can calibrate your spectra or your spectrometer because the spectrum of a compact fluorescent light bulb is well known. Two lines in particular are very stable and easy to recognize: Spectral Workbench calibration guide * **Mercury 2 line:** "middle blue line" at 435.833 nanometers * **Mercury 3 line:** "bright green line" at 546.074 nanometers Click the **Calibrate** button and you'll be guided through identifying and clicking on each of these lines. Once you've calibrated a single spectrum, you'll be able to apply that calibration to all of the spectra you collected with that instrument. Watch this video for a walkthrough of the whole process: ##Known issues## There is still a bug in the code that can cause odd calibration results -- Jeff needs to fix it (sorry!). Try pressing "re-extract" than after it clears the previous calibration, clicking "calibrate" again and following the instructions once more. Try comparing your calibration to another (search for "CFL calibration"). ##Custom calibrations## You can calibrate a spectrum with 2 known pixel positions and corresponding wavelength values with the following URL format: > https://spectralworkbench.org/spectrums/calibrate/?x1=242&w1=554&x2=483&w2=780 Where is the ID of your spectrum, x1 and x2 are the pixel locations, and w1 and w2 are the wavelengths for those positions.