Relation between power fector and input power
Power factor PF is highly related to actual power, usually ,it is index of rated input power and should not drift from rated power obviously. Power factor PF concerns not only input power but also input voltage.
Follwing relationship is always established:
1.The lower the input voltage, the higher the PF value, vice versa.
2.The smaller the input power, the lower the PF value, vice versa.
3.Power factor is high when ohmic load and low when LED lamp load. Generally, it’s recommended to use 80% above actual power of selected LED driver, PF value can meet Energy Star standard.