All gases produce spectral lines which are specific to the gas, superimposed on a background of continuum radiation. With all gases, low current-densities produce mostly spectral lines, with the highest output being concentrated in the near-IR between 650 and 1000 nm. Krypton's strongest peaks are around 760 and 810 nm. Argon has many strong peaks at 670, 710, 760, 820, 860, and 920 nm. Neon has peaks around 650, 700, 850, and 880 nm. As current densities become higher, the output of continuum radiation will increase more than the spectral-line radiation at a rate 20% greater, and output center will shift toward the visual spectrum. At greybody current-densities there is only a slight difference in the spectrum emitted by various gases. At very high current-densities, all gases will begin to operate as blackbody radiators, with spectral outputs resembling a blue giant star, centered in the UV.