I've got a m265 led and I'm trying to calibrate this aberration corrected spherical grating (833nm) with a range of 100-320nm. 2.4mm/nm. At Around 5 degrees the grating has the image of a horizontal line which rises quickly because the chamber is much less reflective than the entrance pipe. The peaks at 11 are the diffraction orders. Because I only have one light source does this mean than I can't calibrate fully I can only get a wavelength offset. I can't use the peak widths because they get broardened right ?? Or can I just take the 265nm divided by distance from central peak to get the gradient of my calibration plot. The filter is one that only lets through UV. I need to write a report on this and I'm so worried I just physically can't do it with one light source. If I try to calibrate it using the peaks I get that abs graph where the orange one is a calibration example from manual