01784nas a2200289   4500000000100000000000100001000000100002008004100003653002100044653002100065653001700086653002000103653001400123653002400137653001500161653001400176653002900190653002800219653001900247100001800266245010600284856014600390300001000536490000700546520092100553022002001474       2019                            d10aArtificial light10aCelestial bodies10aGround based10aLight pollution10aLuminance10aPhotometric systems10aPhotometry10aPollution10aQuantitative measurement10aTransformation constant10aVisual effects1 aSalvador Bara00aBlack-body luminance and magnitudes per square arcsecond in the Johnson-Cousins BVR photometric bands  uhttps://www.scopus.com/inward/record.uri?eid=2-s2.0-85073565416&doi=10.4302%2fplp.v11i3.926&partnerID=40&md5=8173fb19e6878328c2179d75609e44c4  a63-650 v113 aA relevant number of light pollution studies deal with unwanted visual effects of artificial light at night, including the anthropogenic luminance of the sky that hinders the observation of celestial bodies which are the main target of ground-based astrophysical research, and a key asset of the intangible heritage of humankind. Most quantitative measurements and numerical models, however, evaluate the anthropogenic sky radiance in any of the standard Johnson-Cousins UBVRI photometric bands, generally in the V one. Since the Johnson-Cousins V band is not identical with the visual CIE V(λ) used to assess luminance, the conversion between these two photometric systems turns out to be spectrum-dependent. Given its interest for practical applications, in this Letter we provide the framework to perform this conversion and the transformation constants for black-body spectra of different absolute temperatures.  a20802242 (ISSN)