I have project to determine the action spectrum for phototherapy of neonatal jaundice. Since 1958 this has been widely assumed to overlap the in-vitro absorption spectrum which has a maximum at 460 nm. There is now convincing evidence for an action spectrum centred on about 480 nm. I want to illustrate my report to CIE with graphs of the "classic" absorption spectrum and the spectrum recommended by authors such as Lamola and Ebbesen.

Although there are plenty of papers showing the in-vitro absorption spectrum centred on about 460 nm, no one seems to give a reference shwing where that came from. I can only refer to it as the "classic" spectrum, as if it has the status of "E=mc2" and everyone knows that came fro Einstein 1905!

Has anyone got an original reference for the often quoted absorption spectrum centred on about 458 nm?

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