The plots below are NIST traceable absolute spectral irradiance, at a distance of 20cm in the center of the beam. The lamp was measured with an OL-756 double grating spectroradiometer, using a 20mm entrance aperture on the integrating sphere, 1nm wavelength increment.
On a linear scale the spectrum looks like others we have seen, prominent Hg line and little else discernible.
The same data plotted on a log scale however reveals what is underneath. Numerous fine Hg emission lines and the underlying