January 5, 2010
Nate - The source for my formula is a NOAA document regarding UV index calculation, available here. I believe the UV index calculation takes the relative damage that any one wavelength causes into account. After summing the contribution of each individual wavelength over the wide spectrum of UV light present in sunlight, you get a value that represents the total hazard for UV exposure on a linear scale (an index of 10 is twice as harmful as an index of 5). A higher UV intensity as read by this sensor would likely correlate with a higher index, but it might be difficult to directly correlate the two. As you indicated, you could integrate the value from this sensor over time to get a general measure of exposure, the trick would be finding out how much would pose a health or burn hazard. Any volunteers?? :)
The UV index is calculated by integrating along a weighting curve, meaning the intensity of some individual wavelengths will have a greater contribution to the overall index than others. A plot of this curve can be seen here. Unless this plot happens to exactly match the response curve of this particular sensor, then the UV index can not be precisely calculated.
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