In article <33F88EFA.8DB3A67E at mail.telepac.pt>, Monica Moura
<mtmoura at mail.telepac.pt> wrote:
> Please forgive me if this is too basic (or off topic) to post here, but
> I wonder if anyone could please help me with this conversion problem I
> have. How can I convert a value that is in lux (illuminance) to
Have a look at "Plotting rates of Photosynthesis as a function of light
quality" Dean L (1996), the American Biology Teacher vol 58, p.424-426.
What he says is not entirely accurate and the experiments and conclusions
reported there are rather weak (I disagree with several of them), so I do
not recommend this for reading or taking seriously what is said in there.
However, he lists a number of useful references.
Here's a truncated quotation you might find useful:
"If the light source is a tungsten filament, an estimate of the photon
fluence rate in micromol photons m^-2s^-1 can be obtained by dividing the
lux value at a given distance by 50 (Table 3, Thimijan and Heins 1983)"
My Usenet Law#1: If something can be misconstrued, cynically answered to,
or dismissed with an insult or mockery, it will be.
My Usenet Law#2: Do not let Law #1 discourage you from making intelligent,
articulate posts. You might get enlightning or helpful answers, and even