I used them in my 3D printer case. They stick at the top, point perfectly downwards and don't open even at 40 degrees Celsius. I also went with this one specifically because I can control the lighting with the watch face, which works pretty well. However, for some reason it doesn't turn off completely, reaching a point where it "clicks" and should turn off, but there's still a faint light coming from them. Therefore only 4 stars, otherwise a great buy for the price.
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