I doubt anybody uses it but my guess its to look for burst pixels or whatever. Does anyone know for sure? curious like the cat.

:”People who are not themselves, are nobody.” George S. Patton

Often times it works well for reading in low light conditions, when not wanting to disturb others

Never thought of that.

:”People who are not themselves, are nobody.” George S. Patton

My hubby reads in bed at night white on black.
No more trying to sleep ,with his bed side light on.
It's great

Yup, same here! I like to use it like that occasionally.

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