A unit recommended in 1937 by a committee of the Optical Society of America, but probably never used.
Loyd A. Jones.
Colorimetry: Preliminary draft of a report on nomenclature and definitions.
Journal of the Optical Society of America, volume 27, page 211 (June 1937).
Page 211: “Referring again to Table I, terms (21) and (22) represent names for units which the committee [Committee on Colorimetry, Optical Society of America–ed.] has voted to adopt. The decision was almost unanimous [16 to 2–ed.] in the case of recommending talbot as a psychophysical correlate of joule. The vote on lumerg as the psychophysical correlate of the erg was less unanimous [11 to 9–ed.]”
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