Can you explain your testing a little more.
Did you use 2 or 3 different devices to test the lighting? There is no single device that I know of that can function with all three lighting modes you describe. This would be more useful if you provide some details on the device(s) used for testing.
I assume:
Back - LCD or OLED screen with a backlight or integral light.
Front - e-ink with a front light (Kindle Paperwhite, Kobo Clara HD or similar)
Natural - e-ink with front light disabled (or not present)
Can you confirm what devices you actually used?
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