Practice question

What is the purpose of the ballast in an HPS roadway luminaire?

  1. To physically support the lamp
  2. To regulate the current flowing through the lamp and provide the starting voltage to ignite the arc
  3. To focus the light beam
  4. To filter UV radiation

Answer: B — To regulate the current flowing through the lamp and provide the starting voltage to ignite the arc

The correct answer is shown above. Try the full quiz for additional practice.

Practice more: IMSA Roadway Lighting I Practice Questions - IMSA Roadway Lighting Technician Level I Certification Exam Exam →