English: Wear in a fluorescent tube that was turned on and off regularly. The metal forming the cathode sputters and then vaporizes, quickly adhering to the cooler glass surrounding the electrode. This forms a darkened area on the glass from the metallic deposits. The sputter eventually destroys the electrodes, increasing their work function until the lamp can no longer start.
Français : Dégradation d’un tube fluorescent par pulvérisation des électrodes, dont la matière se dépose sur la paroi intérieure et cause un obscurcissement caractéristique.
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