Practice question

What is 'flicker' in LED roadway lighting and what causes it?

  1. The normal startup sequence of an LED luminaire
  2. Rapid modulation of light output caused by variations in the driver's DC output, often linked to poor power quality, driver malfunction, or incompatible dimming controls
  3. The LED changing color over time
  4. The luminaire swinging in the wind

Answer: B — Rapid modulation of light output caused by variations in the driver's DC output, often linked to poor power quality, driver malfunction, or incompatible dimming controls

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