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link between einstein and lux

Tony Travis ajt at rri.sari.ac.uk
Wed Dec 13 11:17:45 EST 1995

Harald Teicher wrote:
> Sonia Amorosi (sonia at eagle.bio.unipr.it) wrote:
> : Hello.
> : Could anybody tell us which is the correlation between lux and einstein?
> : Thank you very much
> try these
> conversion factors, k_lux to u_mol m_2 s_1
> [...]

The lux is a standard of 'brightness' or illumination in terms of its
visual effect (as determined by 100 pairs of standard American eyes
apparently) and is used by architects.  Lux meters were produced to
measure the illumination level in buildings objectively, but the
standard is based on a subjective impression of brightness and is not
compatible with measurements in terms of the Einstein unit:

	quantum flux density = micro einstein / m2 / s 

A lux meter is most likely to be a radiometer:

	1 lux = 1 lumen / m2
	1 lumen at 555nm = 1.47 mW

Dr. A.J.Travis,                       |  mailto:ajt at rri.sari.ac.uk
Rowett Research Institute,            |
Greenburn Road, Bucksburn,            |   phone:+44 (0)1224 712751
Aberdeen AB2 9SB, Scotland, UK.       |     fax:+44 (0)1224 716687

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