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Werner,<br>
lux (or lumens/m2) is a measure of luminous power as opposed to a
measure of "pure" radiative power. A measure of pure radiative power
weights all wavelengths of the radiation equally whereas measures of
luminous power account for the fact that the eye is more sensitive to
visible light wavelengths. There is certainly a relationship between
the amount of solar radiation amount and the luminous radiation called
the luminous efficacy. I have seen methods for calculating the luminous
efficacy of certain window and skylight configurations but there is
also a luminous efficacy associated with the atmosphere. If you run one
of the TMY2 sites from the US, and look at the output for illuminance
and solar radiation, you can divide one by the other and see what the
general magnitude of the luminous efficacy is.<br>
That was probably more informative than helpful...<br>
Cheers,<br>
David<br>
<br>
<br>
keilholz, werner wrote:
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<p class="MsoNormal"><font face="Arial" size="2"><span
style="font-size: 10pt; font-family: Arial;">Dear TRNSYS users, <o:p></o:p></span></font></p>
<p class="MsoNormal"><font face="Arial" size="2"><span
style="font-size: 10pt; font-family: Arial;"><o:p> </o:p></span></font></p>
<p class="MsoNormal"><font face="Arial" size="2"><span
style="font-size: 10pt; font-family: Arial;" lang="EN-GB">I just ran
into a weather data file with solar
radiation data in ‘lux’.<o:p></o:p></span></font></p>
<p class="MsoNormal"><font face="Arial" size="2"><span
style="font-size: 10pt; font-family: Arial;" lang="EN-GB"><o:p> </o:p></span></font></p>
<p class="MsoNormal"><font face="Arial" size="2"><span
style="font-size: 10pt; font-family: Arial;" lang="EN-GB">Now, that’s
even worse than the usual kj/hr.m^2…
Illuminance (in lux or cd/m^2) is a different dimension than Flux (in
W/m^2),
but one might think there should be some relation between the two.<o:p></o:p></span></font></p>
<p class="MsoNormal"><font face="Arial" size="2"><span
style="font-size: 10pt; font-family: Arial;" lang="EN-GB">Is there a
way to compute (diffuse?) radiation from
it?<o:p></o:p></span></font></p>
<p class="MsoNormal"><font face="Arial" size="2"><span
style="font-size: 10pt; font-family: Arial;" lang="EN-GB"><o:p> </o:p></span></font></p>
<p class="MsoNormal"><font face="Arial" size="2"><span
style="font-size: 10pt; font-family: Arial;" lang="EN-GB">Thanks, <o:p></o:p></span></font></p>
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<p><b><font face="Verdana" size="2"><span
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<p><b><font color="#0000a1" face="Verdana" size="3"><span
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</span></font></b><font face="Verdana" size="2"><span
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