Thanks Edith that is good news that I can do a meaningful measurement. Any source of info on specifically what the low E windows are blocking and how much? I have not found much on the web so far...

Does the EasyBloom give accurate readings when used indoors and I have new low "E" windows ? My plants have done poorly since the installation of the windows. thanks Randy P.S. Great product !

I tested again today, it was very sunny out. I got 2 hrs of moderate and 6 hours between bright and strong. I was worried about the low "E" windows that I had installed last winter were killing off all my plants. thanks very much Randy

I did an indoor monitor near my West facing window. I got a very low sunlight readings. Does the unit really adjust for cloudy days? Should I try again on a sunny day ?