All of the Kobo devices with lights can have the light turned off completely. I think the Kindles are always on, but the lowest level is very dim.
The Kobo Aura ONE and upcoming Aura H2O Edition 2 have the ability to change to colour of the light. It is mainly intended to remove blue during the evening. I have no idea whether this would help you or hurt, but if you have a chance to experiment with one, you should.
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