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Subject: Measuring UV

Measuring UV

From: Kilian Anheuser <kilian.anheuser>
Date: Monday, September 4, 2006
Carlyn Hammons <carlyn.hammons [at] thc__state__tx__us> writes

>...  I am in search for some obscure information and hope
>that someone here might be able to help.  I know that there is a
>very complicated formula for determining microwatts per lumen using
>the combination of a lux meter and a UV meter which gives readings
>in microwatts per square centimeter.  Does anyone recall this

This is how you get there:

    1 lux = 1 lumen per square m (by definition)
    1 square m = 10,000 square cm


1 microWatt per square cm = 0.0001 microWatt per square m = 0.0001
microWatt / lux per lumen

This gives you:

    1 microWatt per lumen = 10,000 microWatt per square cm and lux

So, what you need to do is:

    Take your UV meter reading in microWatt per square cm
    Multiply by 10,000
    Divide by your luxmeter reading (in lux)
    Now you have your microWatts per lumen


    Your UV meter reading is 0.3 microWatts per square cm
    At the same time and in the same place you measure 50 lux
    Calculate: 0.3 x 10'000 / 50 = 60
    This is a reading of 60 microWatts per lumen

Good luck,

Kilian Anheuser
Conservateur responsable du secteur
Laboratoire, ateliers de restauration et conservation preventive
Musee d'art et d'histoire
Rue Charles-Galland 2
Case postale 3432
1211 Geneve 3
+41 22 418 2520,
Fax: +41 22 418 2511

                  Conservation DistList Instance 20:13
                 Distributed: Friday, September 8, 2006
                       Message Id: cdl-20-13-006
Received on Monday, 4 September, 2006

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