China manufacturer of magnetic ballasts for metal halide flood lights & hps flood lights

An electrical ballast is a device which is used to limit the amount of current in an electrical circuit. An electronic lamp ballast is used to provide the proper starting and operating electrical condition to power one or more fluorescent lamps or the newer HID lamps (high-intensity discharge lamps).Electronic ballasts use solid state electronic circuitry to regulate starting voltage and to maintain proper operating current. Electronic ballasts produce light more efficiently than magnetic ballasts. Electronic ballasts are up to 25 percent more efficient than magnetic ballasts. Another advantage of electronic ballasts is that they eliminate visible flicker and audible hum. Electronic ballasts can operate from one to four lamps at a time. Electronic ballasts are most commonly used for T8 fluorescents and T5 fluorescents. Electronic ballasts are now being made to operate T12 fluorescents in both standard and high output. Over time,electronic ballasts will replace magnetic ballast entirely
1.PF(Power Factor)The electronic ballasts Power Factor are the measurement of how effectively it converts the voltage and current supplied by the power source into watts of usable power delivered to the ballast.Power factor=True power/Apparent powerThe higher the power factor is means the more electrical power you utilize. The PF of electronic ballasts can achieve over 0.9, even 0.99.2.THD(Total Harmonic Distortion)Total Harmonic Distortion: Total harmonic distortion (THD) measures the degree to which the current wave shape is distorted from a sinusoidal wave, expressed as a percentage.3. Ballast Frequency The frequency at which the electronic ballasts operates the lamp, measured in Hertz (Hz) or kilohertz (KHz).