Common Terminology for Ballasts/Electronic Ballasts
1. Ballast Loss
This value represents the energy consumed by the electronic ballast itself that is converted into heat rather than light. It is calculated by subtracting the total power consumed by the lamps from the total power output. Generally, a traditional ballast for two 40W lamps consumes approximately 22W, whereas an electronic ballast consumes about 7W.
2. Ballast Factor
This value indicates the relative light output performance when using an electronic ballast. It is calculated as a percentage by dividing the measured light output of the electronic ballast by the light output obtained when using a standard reference ballast. Generally, a higher value indicates better light output performance. For standard electronic ballasts, this value should not be less than 0.9; however, there are electronic ballasts specifically designed for high output, where the ballast factor can range from 1.18 to 1.28.
3. Ballast Efficacy Factor
This value is calculated by dividing the Ballast Factor by the ballast's input power. In the US market, vendors often use this figure to compare the efficiency of different electronic ballasts; a higher value indicates superior efficiency.
4. Crest Factor
Also known as the peak-to-RMS ratio, this value has a direct and significant impact on lamp lifespan. Most lamp manufacturers recommend keeping this value below 1.7. An excessively high value tends to cause lamp blackening and reduce the lamp's service life. The Crest Factor is defined as the peak current generated when the electronic ballast operates the fluorescent lamp, divided by the average current.
5. Power Factor
This value indicates the efficiency with which an electronic ballast converts input voltage and current into usable power. A higher power factor is highly beneficial to utility companies. To encourage the use of high-power-factor electronic ballasts, utility companies abroad often implement subsidy policies. However, a common misconception among consumers is that a higher PF value automatically equates to greater energy savings; in reality, the amount of energy saved is unrelated to the PF value.
6. Total Harmonic Distortion (THD)
In standard three-phase power supply systems, harmonics that are multiples of the fundamental frequency (50/60 Hz)—such as the 3rd, 6th, 9th, and 12th harmonics—tend to distort the AC sine wave. This can induce excessive currents that may damage electrical equipment. Regarding electronic ballasts, safety standards worldwide mandate that Total Harmonic Distortion (THD) remain below specific limits. Standards such as IEC (Europe), ANSI (USA), CNS (Taiwan), and JIS (Japan) require THD to be less than 33%. However, the US market categorizes electronic ballasts into different tiers based on THD levels (e.g., THD < 20%). Generally, in environments with extensive computer usage or precision electronic equipment, ballasts with stricter (lower) THD specifications should be used.
7. Parallel vs. Series Circuits
When a single electronic ballast powers two lamps simultaneously, the circuit configuration is either parallel or series. In a series design, if one lamp fails, the other immediately goes out; in a parallel design, the other lamp remains lit. Generally, parallel circuits require two separate circuit loops, making them more costly than the single-loop configuration used in series designs. However, designing parallel circuits is complex; proper handling is required when one lamp fails to prevent power or frequency from shifting to the remaining lamp. If the circuit is not designed correctly, the load on the remaining lamp increases, thereby accelerating the likelihood of its failure.
8. Audible Noise
Electrical safety standards in all countries specify noise limits for electronic ballasts; generally, electronic ballasts generate 75% less noise than traditional ballasts. CNS standards require that the noise level of electronic ballasts remain below 33 dB.
9. Active vs. Passive Power Factor Correction (PFC)
Electronic ballasts designed to improve power factor can utilize either active or passive PFC circuits. The key difference lies in how power—and consequently light output—reacts to voltage fluctuations; passive PFC circuits cannot raise the power factor above 0.99, and power levels fluctuate alongside voltage changes, sometimes causing lamp flickering. In contrast, active PFC designs avoid these issues. Therefore, active PFC models are preferable for regions with unstable voltage.
10. High Output
Electronic ballast design generally follows one of two paths: energy conservation or increased light output. When designing for high output, the choice of lamp is critical; standard traditional lamps are unsuitable. Instead, lamps specifically engineered for electronic ballasts must be used. These lamps are characterized by higher operating voltages and thicker filaments. Examples include the HF (high-frequency) lamps used in the Japanese market and the T8 32W HF lamps common in Europe and the US; examining their filament structures reveals the use of thicker, heavier-gauge wire (stick coils) capable of withstanding higher currents.
11. Electromagnetic Interference/Electromagnetic Compatibility (EMI/EMC/EMS)
All high-frequency electronic products generate noise. Electronic noise interference can be categorized into conducted interference and radiated interference. Generally, conducted interference travels through power lines to disrupt the normal operation of other electronic devices or appliances, whereas radiated interference propagates through space to affect other equipment. Regarding the use of electrical appliances, most countries have established safety regulations to prevent electromagnetic interference; examples include the European IEC (EN55015), US FCC Part 18, and Japanese JIS standards, which cover both commercial and residential applications. European regulations in this area are particularly stringent. Facilities sensitive to electromagnetic interference—such as corporate data centers, locations using precision electronic instruments or testing equipment, hospitals, and broadcasting studios—should specifically require the use of electronic ballasts that comply with EMI/EMC standards.
12. AC/DC Compatibility (AC/DC Exchangeable)
Due to their energy efficiency, electronic ballasts are highly suitable for emergency lighting applications. Utilizing an electronic ballast designed for both AC and DC operation can extend emergency lighting duration and light output, thereby enhancing public safety and reducing the risk of casualties.
13. Flicker
Traditional ballasts typically operate at the same frequency as the power supply system—50 or 60 cycles per second (50/60 Hz)—resulting in a flicker level of approximately 33%. In contrast, electronic ballasts operate at high frequencies ranging from 20 kHz to 50 kHz, keeping flicker below 5%; if active power factor correction is employed, flicker can be reduced to below 2%. A lower flicker level is more comfortable for the eyes and minimizes eye fatigue.
14. Protection Circuits
Electronic ballasts feature a highly precise internal structure, containing anywhere from sixty to over a hundred electronic components. Beyond supplying the stable current required for lamp operation, they must be designed to withstand various unexpected events that could damage the unit. Consequently, a well-designed electronic ballast incorporates comprehensive protection circuitry—covering the scenarios listed below—to ensure reliable, long-term performance.
Open/Short Circuit Protection
Lightning/Surge Protection (Inrush Current Protection)
Over-Voltage Protection
Under-Voltage Protection
End-of-Lamp-Life Protection
Lamp Leakage Protection
Electrostatic Discharge (ESD) Protection
Auto-Reset Function
15. Dimmable Electronic Ballast
An electronic ballast equipped with dimming capabilities is known as a dimmable electronic ballast. The technology centers on the dimming range—such as 50%, 20%, 10%, or even 1% output. These ballasts often integrate the following functions to achieve energy savings of over 80%:
Daylight-sensing dimming
Timer-based switching
Remote control switching
Motion/Presence-sensing switching
16. Operating Temperature Range
Temperature fluctuations significantly impact the functionality and lifespan of electronic components; therefore, electronic ballasts must be operated within their specified temperature ranges. Requirements vary by region—for instance, cold and tropical climates demand different temperature specifications—and designs must account for operating temperatures reaching as high as 60°C.
17. Lamp Lifespan
The lifespan of a lamp is closely linked to the starting method of the electronic ballast; factors such as the starting method and the crest factor should be considered. Selecting a high-quality electronic ballast not only saves energy but can also extend the lamp's lifespan by more than 50%. However, if a high-output electronic ballast is used, the lamp will only achieve its standard rated lifespan.
18. Potting
Many electronic ballasts on the market use potting compounds to enhance heat dissipation and reduce the impact of temperature on electronic components. However, this results in greater weight and bulk, making them less suitable for ultra-slim light fixtures. Even in the US market—where potted ballasts are currently common—there is a gradual shift toward the lighter, non-potted electronic ballasts typical of the European market.
This value represents the energy consumed by the electronic ballast itself that is converted into heat rather than light. It is calculated by subtracting the total power consumed by the lamps from the total power output. Generally, a traditional ballast for two 40W lamps consumes approximately 22W, whereas an electronic ballast consumes about 7W.
2. Ballast Factor
This value indicates the relative light output performance when using an electronic ballast. It is calculated as a percentage by dividing the measured light output of the electronic ballast by the light output obtained when using a standard reference ballast. Generally, a higher value indicates better light output performance. For standard electronic ballasts, this value should not be less than 0.9; however, there are electronic ballasts specifically designed for high output, where the ballast factor can range from 1.18 to 1.28.
3. Ballast Efficacy Factor
This value is calculated by dividing the Ballast Factor by the ballast's input power. In the US market, vendors often use this figure to compare the efficiency of different electronic ballasts; a higher value indicates superior efficiency.
4. Crest Factor
Also known as the peak-to-RMS ratio, this value has a direct and significant impact on lamp lifespan. Most lamp manufacturers recommend keeping this value below 1.7. An excessively high value tends to cause lamp blackening and reduce the lamp's service life. The Crest Factor is defined as the peak current generated when the electronic ballast operates the fluorescent lamp, divided by the average current.
5. Power Factor
This value indicates the efficiency with which an electronic ballast converts input voltage and current into usable power. A higher power factor is highly beneficial to utility companies. To encourage the use of high-power-factor electronic ballasts, utility companies abroad often implement subsidy policies. However, a common misconception among consumers is that a higher PF value automatically equates to greater energy savings; in reality, the amount of energy saved is unrelated to the PF value.
6. Total Harmonic Distortion (THD)
In standard three-phase power supply systems, harmonics that are multiples of the fundamental frequency (50/60 Hz)—such as the 3rd, 6th, 9th, and 12th harmonics—tend to distort the AC sine wave. This can induce excessive currents that may damage electrical equipment. Regarding electronic ballasts, safety standards worldwide mandate that Total Harmonic Distortion (THD) remain below specific limits. Standards such as IEC (Europe), ANSI (USA), CNS (Taiwan), and JIS (Japan) require THD to be less than 33%. However, the US market categorizes electronic ballasts into different tiers based on THD levels (e.g., THD < 20%). Generally, in environments with extensive computer usage or precision electronic equipment, ballasts with stricter (lower) THD specifications should be used.
7. Parallel vs. Series Circuits
When a single electronic ballast powers two lamps simultaneously, the circuit configuration is either parallel or series. In a series design, if one lamp fails, the other immediately goes out; in a parallel design, the other lamp remains lit. Generally, parallel circuits require two separate circuit loops, making them more costly than the single-loop configuration used in series designs. However, designing parallel circuits is complex; proper handling is required when one lamp fails to prevent power or frequency from shifting to the remaining lamp. If the circuit is not designed correctly, the load on the remaining lamp increases, thereby accelerating the likelihood of its failure.
8. Audible Noise
Electrical safety standards in all countries specify noise limits for electronic ballasts; generally, electronic ballasts generate 75% less noise than traditional ballasts. CNS standards require that the noise level of electronic ballasts remain below 33 dB.
9. Active vs. Passive Power Factor Correction (PFC)
Electronic ballasts designed to improve power factor can utilize either active or passive PFC circuits. The key difference lies in how power—and consequently light output—reacts to voltage fluctuations; passive PFC circuits cannot raise the power factor above 0.99, and power levels fluctuate alongside voltage changes, sometimes causing lamp flickering. In contrast, active PFC designs avoid these issues. Therefore, active PFC models are preferable for regions with unstable voltage.
10. High Output
Electronic ballast design generally follows one of two paths: energy conservation or increased light output. When designing for high output, the choice of lamp is critical; standard traditional lamps are unsuitable. Instead, lamps specifically engineered for electronic ballasts must be used. These lamps are characterized by higher operating voltages and thicker filaments. Examples include the HF (high-frequency) lamps used in the Japanese market and the T8 32W HF lamps common in Europe and the US; examining their filament structures reveals the use of thicker, heavier-gauge wire (stick coils) capable of withstanding higher currents.
11. Electromagnetic Interference/Electromagnetic Compatibility (EMI/EMC/EMS)
All high-frequency electronic products generate noise. Electronic noise interference can be categorized into conducted interference and radiated interference. Generally, conducted interference travels through power lines to disrupt the normal operation of other electronic devices or appliances, whereas radiated interference propagates through space to affect other equipment. Regarding the use of electrical appliances, most countries have established safety regulations to prevent electromagnetic interference; examples include the European IEC (EN55015), US FCC Part 18, and Japanese JIS standards, which cover both commercial and residential applications. European regulations in this area are particularly stringent. Facilities sensitive to electromagnetic interference—such as corporate data centers, locations using precision electronic instruments or testing equipment, hospitals, and broadcasting studios—should specifically require the use of electronic ballasts that comply with EMI/EMC standards.
12. AC/DC Compatibility (AC/DC Exchangeable)
Due to their energy efficiency, electronic ballasts are highly suitable for emergency lighting applications. Utilizing an electronic ballast designed for both AC and DC operation can extend emergency lighting duration and light output, thereby enhancing public safety and reducing the risk of casualties.
13. Flicker
Traditional ballasts typically operate at the same frequency as the power supply system—50 or 60 cycles per second (50/60 Hz)—resulting in a flicker level of approximately 33%. In contrast, electronic ballasts operate at high frequencies ranging from 20 kHz to 50 kHz, keeping flicker below 5%; if active power factor correction is employed, flicker can be reduced to below 2%. A lower flicker level is more comfortable for the eyes and minimizes eye fatigue.
14. Protection Circuits
Electronic ballasts feature a highly precise internal structure, containing anywhere from sixty to over a hundred electronic components. Beyond supplying the stable current required for lamp operation, they must be designed to withstand various unexpected events that could damage the unit. Consequently, a well-designed electronic ballast incorporates comprehensive protection circuitry—covering the scenarios listed below—to ensure reliable, long-term performance.
Open/Short Circuit Protection
Lightning/Surge Protection (Inrush Current Protection)
Over-Voltage Protection
Under-Voltage Protection
End-of-Lamp-Life Protection
Lamp Leakage Protection
Electrostatic Discharge (ESD) Protection
Auto-Reset Function
15. Dimmable Electronic Ballast
An electronic ballast equipped with dimming capabilities is known as a dimmable electronic ballast. The technology centers on the dimming range—such as 50%, 20%, 10%, or even 1% output. These ballasts often integrate the following functions to achieve energy savings of over 80%:
Daylight-sensing dimming
Timer-based switching
Remote control switching
Motion/Presence-sensing switching
16. Operating Temperature Range
Temperature fluctuations significantly impact the functionality and lifespan of electronic components; therefore, electronic ballasts must be operated within their specified temperature ranges. Requirements vary by region—for instance, cold and tropical climates demand different temperature specifications—and designs must account for operating temperatures reaching as high as 60°C.
17. Lamp Lifespan
The lifespan of a lamp is closely linked to the starting method of the electronic ballast; factors such as the starting method and the crest factor should be considered. Selecting a high-quality electronic ballast not only saves energy but can also extend the lamp's lifespan by more than 50%. However, if a high-output electronic ballast is used, the lamp will only achieve its standard rated lifespan.
18. Potting
Many electronic ballasts on the market use potting compounds to enhance heat dissipation and reduce the impact of temperature on electronic components. However, this results in greater weight and bulk, making them less suitable for ultra-slim light fixtures. Even in the US market—where potted ballasts are currently common—there is a gradual shift toward the lighter, non-potted electronic ballasts typical of the European market.
Aug 14,2026