The power factor of HPS ballastThe power factor of HPS ballast

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The power factor of HPS ballast

2014-04-07 15:43:11

The ratio of (line wattage to line volts X lamps), expressed as a percent. A high power factor (HPF)HPS ballast must

have a power factor of at least 90%. Anything less is considered normal power factor (NPF). NPF designs normally range from 40-60%.AnNPF ballast draws about twice the operating line current of an HPF design and may require larger conductors, switches, breakers or distribution transformers for the same lighting load. Where an

NPF lighting load adversely affects overall power factor, energy rates may be significantly increased.

A lag-type regulating ballast will have a power factor greater than 90% throughout the rated life of the lamp regardless of line voltage or lamp aging. A lead-type regulating ballast will initially have at least 90% PF but may drop as low as 65% due to lamp aging. It is possible for HPF non-regulating ballasts to drop below 90% as lamps and capacitors age.

Light output ratings published by lamp manufacturers are based on powering the lamp with a "reference ballast" as specified by ANSI standards. The ballast factor of a particular ballast provides a measure of expected light output. Electronic ballasts have several different ballast factors. This enables the lighting system designer to adjust the lighting level to meet the requirements of a particular application. The lighting system designer can trade watts for lumens by selecting the appropriate ballast.

China manufacturer of magnetic ballasts for metal halide flood lights & hps flood lights