Solar Radiation, UV and Illuminance are 3 different entities, but the following measurement: As it can be observed, all "peaks & valleys" on the plots above are the SAME, besides a multiplier (power of 10, or other). 1) Are Solar Rad, UV and Illuminance correlated by a multiplier? 2) Are there actually 3 individual sensors - for Solar Rad, UV, Illuminance? 3) Are there a correlation, individual sensors, or a PWS manufacturer "feature"?! Comments or thoughts. Xant -- You received this message because you are subscribed to the Google Groups "weewx-user" group. To unsubscribe from this group and stop receiving emails from it, send an email to weewx-user+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/weewx-user/7e579b6c-00dd-416e-b59c-52a9a79519be%40googlegroups.com.