Editing Lux (section)

==Non-SI units of illuminance==
The corresponding unit in English and American traditional units is the [[foot-candle]]. One foot candle is about 10.764&nbsp;lx. Since one foot-candle is the illuminance cast on a surface by a one-candela source one foot away, a lux could be thought of as a "metre-candle", although this term is discouraged because it does not conform to SI standards for unit names.

One [[phot]]&nbsp;(ph) equals 10 kilolux (10 klx).

{{anchor|Nox}}One nox&nbsp;(nx) equals 1 millilux (1 mlx) at light color 2042&nbsp;K or 2046&nbsp;K (formerly 2360&nbsp;K).<ref name="Lohse-Stille_1948"/><ref name="Westphal_1952"/><ref name="Grimsehl_1988"/><ref name="Keplinger_2021"/>

In [[astronomy]], [[apparent magnitude]] is a measure of the illuminance of a star on the Earth's atmosphere. A star with apparent magnitude 0 is 2.54 microlux outside the earth's atmosphere, and 82% of that (2.08 microlux) under clear skies.<ref name="Schlyter7"/> A magnitude 6 star (just barely visible under good conditions) would be 8.3 nanolux. A standard candle (one candela) a kilometre away would provide an illuminance of 1 microlux—about the same as a magnitude 1 star.