link between einstein and lux

[Richard Winder]

In article <49cvbq$72t at mserv1.dl.ac.uk>, Sonia Amorosi 
<sonia at eagle.bio.unipr.it> writes:
>Hello.
>Could anybody tell us which is the correlation between lux and einstein?
>Thank you very much

There is very little correlation, especially if the spectral distribution 
of the light source isn't specified.  Lux expresses light intensity in terms
of the sensitivity of the human eye.  An einstein is a mole (Avogadro's number)
of photons.  Even if you do know the spectral distribution of the light source,
converting lux to, say, microeinsteins of photosynthetically active photons 
per meter square per second is dicey at best.  -RSW

  RICHARD WINDER                    Title: Research Scientist
  Canadian Forest Service           Phone: (604) 363-0773
  Victoria, B.C.                    Internet: RWINDER at A1.PFC.Forestry.CA