# 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

From the author :

Hi,

The data is in W/sr/m2.

Best,

Jussi

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It should be a radiance/nm. So you have to take into account the 2 nm spectral window width. –  Frédéric Grosshans Dec 3 '10 at 16:49
@Frédéric : Yes, sure, it's the integral of the spectrum which is in w/sr/m². –  Calvin1602 Dec 4 '10 at 0:53