some Testing with the worlds first replica (to our knowledge) of the Ruhmkorff-Lamp, one of the worlds first electric powered lightsources.
this kind of lamp was also described by Jules Verne in his novel "a journey to the center of the earth"
I shot the footage with a Sony EX1R to test the lowlight performance. The lamp does not have a full light spectrum.
This lamp was handmade by Felix Raffalt (electronics) and Lutz Neumann (glassworks).
check out his website: hg-neumann.de