why in neon flash lamp neon gas is present at low pressure ?
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When the current through the lamp is lower than the current for the highest-current discharge path, the glow discharge may become unstable and not cover the entire surface of the electrodes. This may be a sign of aging of the indicator lamp, and is exploited in the decorative "flicker flame" neon lamps.
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Like other gas discharge lamps, the neon lamp has negative resistance; its voltage falls with increasing current after the lamp reaches its breakdown voltage. Therefore, the lamp has hysteresis; its turn-off (extinction) voltage is lower than its turn-on (breakdown) voltage.
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