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The law introduced by Karlsson in spectroscopy of low-redshift quasarsinvolves the Lyman spectrum of hydrogen atoms. Thus, it appears necessary tostudy the concepts introduced by a standard spectroscopy of quasars, studiedhere, with those deducted from $\Lambda$-CDM.A visible absorption of a sharpand saturated spectral line in a gas requires a long path without perturbationsas collisions or cosmological redshift. Spectra of absorbed, saturated lines ofquasars obeying Karlsson's law mainly result from interactions of natural,thermal light radiated by quasar with relatively cold, low presure atomichydrogen. These lines are produced by three processes: a) A conventionalabsorption in a relatively cold gas produces a set of lines; b) These lines aremultiplied by absorption after fundamental 3K or 4K redshifts, where K isKarlsson's constant: Spectra show that redshifts 3K (or 4K) exactly bringabsorbed Lyman beta (or gamma) line on Lyman alpha: redshift almost disappears,and gas lines are intensely absorbed in the absence of alpha absorption; c)Redshifts occur in regions where light at alpha frequency is poorly absorbeddue to permanent redshift, except when excitation of hydrogen to 2P level issufficient for a superradiant flash emission at alpha frequency. This causes anintense absorption of high radiance rays from quasar, so the absorption of aline at current Lyman alpha frequency. Lightning and pumping produce relaxationoscillations that write many absorption lines. Redshifts by H atoms in 2Plevels are due to parametric interactions composed of Impulsive StimulatedRaman Scatterings (ISRS): excited hydrogen atoms catalyze energy exchangesbetween observed ray and background cold thermal radiation, in agreement withthermodynamics. Description of Universe becomes much simpler, but lessmarvelous.

Theoretical spectroscopy of quasars within Karlsson's law