HF & HPF Flo's

[JACKC]

Hello,
I have had the definitions answered from another thread but all that has done is confuse me about what they mean. HF = do they operate at 100Hz due to the ballast units, HPF = where is the power factor corrected?I can only assume from the capacitor or am I totally confused now. Thanks in anticipation.

 

[RF Lighting]

Yep.

HF fittings run at a high frequency due to their electronic control gear. Normal fittings have a choke and switch starter, and run at 50Hz (mains frequency)

In industrial environments, it is normal to install HPF (high power factor) and LPF (low power factor) fittings alternatly in a workshop for example.

The fittings have different value capacitors in them, which gives them different power factors.

This causes them to flicker alternatly, so when one is in its off cycly, the other fitting is on, and vice versa.

This eliminates the stroboscopic effect which can make moving machinery appear stationary, as there is always some light in the workshop from one of the fittings.

 

[Spark123]

Think they are referred to as lead lag fittings, power factor is usually associated with the relationship of real power (W) and apparent power (VA). An inductive load causes the voltage and the current in the circuit to become out of phase with each other, an inductance causes the voltage to lead the current.
A capacitor has the opposite effect i.e. causes current to lead voltage hence a capacitor is used to try and correct the relationship between volts and amps to try and bring the relationship between the two closer together and therefore closer to the real power used.

Another method often used in workshops is to spread the lighting load around the 3 phases as then at no time will all of the fittings be at 0v simultaneously. Using an incandescent lamp is also common on moving machinery.

 

[Lectrician]

A capacitor is placed in series with the fitting to cause the fitting to lead. This is done on every second fitting, or one side of a dual fitting.

HPF are simply used where you install hundreds of fittings in the same area to reduce the inductive reactance.

LPF are cheaper, and normally used in domestic and light commercial.