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I can certainly understand the sensitivity to LCD and CRT screens (and fluorescent lights, etc). However, the OP mentioned that her husband is sensitive to LED lighting, too. I was under the impression that LEDs when used as a light source don't actually blink/flash/refresh, but are in fact a steady stream of light (like when used in headlamps and flashlights). However, my efforts to dig up something conclusive online have failed since blinking/flashing LEDs do get used in so many other things. Unfortunately, most LED flashlights/headlamps also incorporate a blinking "emergency" mode, which absolutely would bother your husband.
As much as I am an advocate for technology, I'd say at this point that sticking with pbooks is probably the safest thing to do.
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