With only a few hours of data, I can see that sensor 2 is definitely giving invalid luminance numbers.

The variance in the other sensors is high, but they follow the same pattern and might be fine with a manual offset. Since it was cloudy today, none of them hit the upper limit of measurement. In previous testing with sensor 1, the limit was 100,000 lux.

Next, I made it rain.

The large spike shows the senors are correctly detecting a change in moisture. Despite being right next to each other, they show very different percentages, as much as 20%. Seeing the moisture level drop off quickly seems like a sign of good drainage, at least down to 3 inches.

It may be worth trying to calibrate the sensors in water. At the very least these give an idea of the relative moisture changing over time.

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