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The redshift-luminosity distributions for well-defined galaxies and quasarsin the Sloan Digital Sky Survey (SDSS) are compared for the tworedshift-distance relations of a Hubble redshift and a de Sitter redshift.Assuming a Hubble redshift, SDSS data can be interpreted as luminosityevolution following the Big Bang. In contrast, given a de Sitter redshift, theintrinsic brightness of objects at all redshifts is roughly the same. In a deSitter universe, 95 per cent of SDSS galaxies and quasars fall into a magnituderange of only 2.8, and 99.7 per cent are within 5.4 mag. The comparable Hubbleluminosity ranges are much larger: 95 per cent within 6.9, and 99.7 per centwithin 11.5 mag. De Sitter space is now widely discussed, but the de Sitterredshift is hardly mentioned.

Intrinsic brightness of SDSS objects is similar at all redshifts in de Sitter space