The most common cause of lamp failure is that which claims most pieces of scientific glassware: physical damage from rough handling or accidents. Even the most carefully handled lamp will eventually fail to operate, however, as the fill gas is adsorbed into the internal surfaces of the lamp. In time, the pressure of fill gas will fall to a level that can no longer sustain the electrical discharge and the lamp will no longer "strike". Operating the lamp at excessive lamp currents will accelerate this process. Attempts to run a lamp at extreme currents can cause the cathode to overheat, and this can damage the cathode.
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