Gas discharge lamps require a ballast to operate. true or false?

• A. Yes
• B. No
• C. Sometimes
• D. Only in some configurations

Answer: (A)

Gas discharge lamps need a ballast to operate because the ionized gas conducts current very readily, so without a limiter the current would surge and damage the lamp and power source. The ballast provides two essential functions: it limits the current to a safe, steady level, and it supplies the high starting voltage needed to strike the arc. Once the lamp is conducting, the ballast continues to regulate current as the lamp’s impedance changes. Modern fixtures may use electronic or magnetic ballasts (or integrated drivers), but the role remains the same. That’s why the statement is true.