If you think you screwed them on tight enough, you're probably wrong. The rubber seal that makes them submersible also makes them difficult to fully fabricate. Do not look directly at the light when switching to yellow or white settings as you will see smudges. You are very bright! Will definitely buy again. Update: if you don't want to get them wet (I use them to light up shelves for example; photos attached) then you might consider removing the rubber pad surrounding the filaments. They are much easier to screw on and off.
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