Fluorescent Tube Operation on AC and DC

Fluorescent tubes are designed to operate efficiently using alternating current (AC), which is the standard power supply in most homes and buildings. However, they can also function when supplied with direct current (DC), although some considerations are necessary.

AC Power for Fluorescent Tubes

• Standard fluorescent lighting fixtures use AC power.
• An AC ballast is crucial for fluorescent lamps. It provides the initial high voltage needed to start the lamp and then limits the current during operation to prevent damage.

DC Power for Fluorescent Tubes

• Fluorescent tubes can be operated on DC power as well.
• When using DC, a current-limiting device, typically a resistor or a specialized DC ballast, is required in place of the standard AC ballast.
• DC operation might cause slightly different effects, such as increased sputtering on the negative electrode compared to AC operation.

Conclusion

Since fluorescent tubes can be powered by both AC and DC sources (with appropriate ballast/current limiting mechanisms), the most accurate answer is that they can be operated on Both AC as well as DC.