ALS reading unreliable due to variable 'range' setting

[ehegnes]

The range of the IR reading can be capped at any value in /sys/bus/iio/devices/iio:device0/range_available. It seems that /sys/bus/iio/devices/iio:device0/range is the current maximum reading, however this is not empirically true. I would assume that this maximum value (range) increases when the current maximum reading is observed for a specified length of time. A reading of above 1000 lux throws off the calibration, as the proportionality of the reading changes.

Either the script must be made to account for these changes in the range, through normalization, or the range must be maintained at a consistent value (probably the maximum value in range_available).