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Yujun,<br>
The illuminance 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>
Kind regards,<br>
David<br>
<br>
<br>
Yujun TAO wrote:
<blockquote cite="mid:224802.21671.qm@web23101.mail.ird.yahoo.com"
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<div>Hello,<br>
Can someone tell me the relation between the solar radiation W/m² and
the illumance? and the unit of the illumance in the type 15?<br>
Thanks<br>
<br>
Yujun TAO <br>
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<br>
<hr size="1"> Envoyé avec <a moz-do-not-send="true"
href="http://us.rd.yahoo.com/mailuk/taglines/isp/control/*http://us.rd.yahoo.com/evt=52423/*http://fr.docs.yahoo..com/mail/overview/index.html">Yahoo!
Mail</a>.<br>
Une boite mail plus intelligente.
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