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i am guessing the the blue light filters on LCD tablets use a different method, to suck some of the blue out of the colour display
I found a setting on my Huwaei tabet which turns on a filter at a set time of evening. that works for me because I am done streaming video by than and will only be using tablet for reading
with Kobo, I have that set to auto filter based on time of day - that also works well
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