Our analytical description of full-field brightness perception data [J. Opt. Soc. Am. A35, B19 (2018)JOAOD60740-323210.1364/JOSAA.35.000B19] with contributions from cone luminance and melanopsin expressing intrinsically photosensitive retinal ganglion cells has been extended [J. Opt. Soc. Am. A35, 1780 (2018)JOAOD60740-323210.1364/JOSAA.35.001780] to include S-cones through a blue-yellow opponent channel. We welcome this reanalysis and provide a few remarks on the approach.

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