the actual power many devices

 the actual power many devices and apparent power difference is very small, negligible, and like  MR16  capacitive devices such as lamps difference is large, is very important. Recently, the U.S. magazine PC Magazine, a study showed that the lamp power factor of 0.65 typical, that the apparent power (VA) than the actual power (Watts) 50% larger!

2, apparent power  T8 Tube 

Apparent power: AC voltage and AC current product. Expressed by the formula: S = UI. Where, S is the rated output power, the unit is VA (VA); U is the rated output voltage, the unit is V, such as 220V, 380V, etc.; I is the rated output current, the unit is A. Apparent power consists of two parts: the active power (P) and reactive power (Q). Active power is the direct acting part. Such as the lamp lights, the motor rotation, so that electronic circuits work. Because of this power have become acting after heat can be directly felt by people, so some people produce an illusion, that is active as the apparent power, active power just do not know what part of the apparent power, expressed by the formula : P = Scosθ = UIcosθ = UI? F. Where, P is the active power, LED Flexi