Light emission spectrum units

Do someone knows the units of the spectra provided here ? It seems obvious enough that it's said nowhere, but even Wikipedia and other sites are quite blurry on this point.

So, is it power ($W$), radiance($\:\rm{W/m^2sr}$), or something else ?

Thanks !

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The README file provided with the samples seems to give all the information you might need. What precisely do you not understand? – Marek Dec 1 '10 at 17:46
It doesn't specify in what units the numbers in the other files are. But I suppose knowing the apparatus that did the measurement can help resolve that issue. – Raskolnikov Dec 1 '10 at 17:54
Yeah, I meant READMEs included with other measurements. But then I noticed that different apparatuses were used in those cases and also different format of data so it's not really very useful. – Marek Dec 1 '10 at 20:20

Usually, the spectrum is in arbitrary unit, proportional to the power, the radiance or whatever. The information the spectrum provides is the relative radiance of various wavelengths which is contained in the spectrum. If you want the radiance of one wavelength band, you simply multiply the relevant band of a normalized spectrum (of integral 1) by the total radiance of your source.

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At the price of those tools, one could expect something better than relative results, and as a matter of fact, the spec (cs.unc.edu/Research/stc/FAQs/spectroradiometer/705spec.pdf) says it can mesure luminance, radiance, and some other things. Anyway, I e-mailed the author, maybe he'll answer.. – Calvin1602 Dec 2 '10 at 8:10

From the author :

Hi,

The data is in W/sr/m2.

Best,

Jussi