Quote Originally Posted by polyglot View Post
Note that a smartphone with a red screen is NOT paper safe, the LCDs do not filter out enough blue/green light. If you put a sheet of rubylith over the face of the phone it should be safe, though your touch interface might be a little iffy depending on the phone model.
Thanks - I did not know this. That said, I use it for the audio. (Un)safe light or not, I always keep it in a recessed shelf under my work table. I set the times and follow the clicks and alarms.

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