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Could you add some sort of filter to the front of this, or any of the others which are suitable bar their brightness?
I'm thinking like a photographic nd filter but in sheet form? Must be something out there like this, either self adhesive or maybe you can tape along the top edge such that the filter can be lifted/flipped during day light/non-sleeping hours?
This is very close to what I want https://mudita.com/products/alarm-clocks/mudita-harmony-2/
but just needs the light to be able to stay on at a very low, barely perceivable, brightness.
the software is OSS though... I may be able to just program the brightness and delay time to achieve it.