[werk_ag]

Hi,

Acording to Solar erythemal ultraviolet radiation, the UV spectrum is divided into UV-C (100 - 280 nm), UV-B (280 - 320 nm), and UV-A (320 - 400 nm) radiation.
Considering that the wavelengths responsible for carcinogenesis are mostly bellow 300nm, your considerations are important.
Anyway, I belive that the readings obtained with a GUVA-S12SD sensor, are not very different than the ones obtained with a Davis.
It would be interesting see a side by side graph of each one for the same place.
I don't have a Davis weather station, but there are some nearby me, and using wunderground, I frequently check their readings against the ones I have, and I never see a great discrepancy. Of course I only do these comparison in days with a very clear sky, without any clouds.
I think that, per example, a reading of 7.4 and 7.8 which represents a 5% difference, may be an important difference for a scientific instrument, but is not for an amateur weather station.

Yesterday my weather station located near Lisbon - Portugal, has registered a maximum UV index of 8.1, not too bad if compared to image below.



Maybe we should open a new thread to talk about UV sensors.