Ballast is composed of electronic components, electronic components of their own parameters have positive and negative error, so when combined into a finished product, the power also produced a difference.

For example, the main control chip, its operating frequency error is.±2KHZ; The error of inductive components is±5%; The error of electrolytic capacitor is±20%; The error of film capacitors such as output capacitors is±5%;

In addition, there are also errors in the power of the lamp, mainly because the lamp voltage is related to the ambient temperature, and the ballast output is relatively constant current, so when the lamp voltage changes, the lamp power will change accordingly, resulting in changes in the ballast input power. Ballast production internal control standard is±10%