The graphs for my light exposure appear mathematically incorrect – what is going on?

They are not incorrect or inaccurate. For light exposure, the scale of the graphs are logarithmic (base 10 in our case). For other measurements like steps, distance, calories and heart rate we use a linear graph. The reason we use logarithmic graphs is because sunlight is much stronger (orders of magnitude) than any indoor light so plotting things this way makes it easier for you to read and understand.

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