My glasses frames are made from fairly light recycled plastic and after knocking the bulb out once in the first week the bulb has stayed in place ever since, even after being knocked off the table several times onto the carpet. Also goes well with my glasses that I use in my workshop. I've only had to charge it once in the 6 weeks I've been using it, although this may change as I get used to using the light and use it more often. My only gripe, and that didn't make me downgrade the star rating, is that I wish it had two levels of brightness as it's a little brighter than I'd like when reading in bed.
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