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AC circuit voltage and current RMS RMS product of apparent power, and active power is just one part of it. Power factor is the active power and apparent lamp power ratio. Low power factor, the current in the higher harmonic content, on the grid, pollution, destruction of the balance of power, reactive power loss increases.
The following energy-saving lamps 25W less power, so little impact on the grid, the International Electrotechnical Commission (IEC) is a high power factor is not required, only that the third harmonic currents less than or equal 86%. National standards will adopt this proposal to modify.
In particular, for the stand-alone electronic ballasts, GB requirements are high power factor. |