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The flicker effect of fluorescent lamps is more pronounced at:
1. Lower voltages
2. Higher voltages
3. Lower frequencies
4. Higher frequencies

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Correct Answer - Option 3 : Lower frequencies

Flicker effect:

  • Fluorescent lamps with magnetic ballasts flicker at a normally unnoticeable frequency of 100 or 120 Hz (twice of the utility frequency; the lamp is lit on both the positive and negative half-wave of a cycle).
  • This flickering can cause problems for some individuals with light sensitivity and are associated with headaches and eyestrain.
  • The flicker effect of fluorescent lamps is more pronounced at lower frequencies.

 

Stroboscopic effect:

  • It is a phenomenon which causes running or moving equipment to appear stationary or appear to be operating slower than they actually are.
  • Fluorescent lamps are provided with 50 Hz ac current supply. When operating under this frequency the lamp becomes zero (crosses zero wave) double the supply frequency, i.e, 100 times for 50 Hz frequency per second. Due to the persistence of vision our eyes do not notice those flickering.
  • However if the light falls on the moving parts due to illusion, they may appear to be either running slow, or in reverse direction or even may appear stationary. This effect is called stroboscopic effect.

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