A reliable, easily constructed, hydrogen discharge lamp has been developed and used extensively during the past several years as a light source for optical experiments in the vacuum ultraviolet, viz., between 900 and 1800 A. The lamp is a rather intense source of radiation consisting of the many lined molecular spectrum of hydrogen.
P. L. HARTMAN and J. R. NELSON, "Hydrogen Lamp of Good Intensity and Reliability for the Vacuum Ultraviolet," J. Opt. Soc. Am. 47, 646-648 (1957)