Page "Flashtube" Paragraph 20
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However, neon signs emit red light because of extremely low current densities when compared to those seen in flashtubes, which favors spectral lines of longer wavelengths.
The spectrum emitted by flashtubes is far more dependent on current density than on the fill pressure or gas type.
Low current densities produce spectral line emission, against a faint background of continuous radiation.
Low current densities produce a greenish-blue flash, indicating the absence of significant yellow or orange lines.
At low current densities, most of xenon's output will be directed into the invisible IR spectral lines around 820, 900, and 1000 nm.
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