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80-watt fluorescent lamp approximately Arc length atom bimetal cathode fall cent characteristics choke voltage circuit colour component condenser conduction constant course current wave current waveform curve cycle discharge lamps discharge lighting discharge tube Edison Swan effect electrodes emission emitted employed energy equal excited filament fluorescent lamp fluorescent powder flux foregoing frequency gas filling gas pressure gases glass glow discharge half-cycle harmonics heat Hence hydrogen inductive control ionization ionization potential lamp current lamp voltage Lamp Watts latter leakage path length low-pressure lumens per watt luminescent luminous efficiency maximum mercury mercury-vapour lamp nddd neon lamp non-sinusoidal normal noted obtained occurs operating orbit phosphorescence positive column positive ion power factor primary produced r.m.s. value reactance relatively resistive control result secondary shown by Fig sinusoidal sodium lamp starter switch supply voltage temperature radiators transformer u.v. radiation ultra-violet vapour visible spectrum volts waveform wavelength zero