I did say it would only work if you set the light once and kept it at that setting all the time, which is exactly my situation. I leave the light on even in bright sunlight, it just makes the page appear whiter, which is still very comfortable for my reading, and it's still at the perfect level for nighttime reading as well. Or when the train passes through long tunnels.
I doubt I'm the only one who sets it once and forgets it, so it just might work for others who leave the light at one setting like me.
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