radio frequency light sources presentation

7/31/2019 Radio Frequency Light Sources Presentation

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Converting electrical power into visibleradiation

No electrodes


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Sheath impedance controls the discharge current ofSheath impedance controls the discharge current ofcapacitive RF dischargecapacitive RF discharge

Power P is proportional to wVrfPower P is proportional to wVrf


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Collection of uncharged molecules

Consists of equal number of positive and negativecharges


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RF lamps appeared about 100 years agoRF lamps appeared about 100 years ago

Glass tube with electrodes at each endGlass tube with electrodes at each end


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Operates over wide range of gas pressureOperates over wide range of gas pressure

Power transfer efficiency=(Pp/(Pp + Pc))Power transfer efficiency=(Pp/(Pp + Pc))


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Wave length is comparable to plasma size

Maintained by electro magnetic waves


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The frequency range between 2.2-3.0MHZ hasThe frequency range between 2.2-3.0MHZ has

reduced restrictions on EMIreduced restrictions on EMI

For frequencies at a few tens of kilohertzFor frequencies at a few tens of kilohertz

generator efficiency is rather highgenerator efficiency is rather high


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Life rating of 15,000 hrLife rating of 15,000 hr

Low infrared and ultra violet emissionLow infrared and ultra violet emission

Good color stabilityGood color stability


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Electrons are emitted from cathodeElectrons are emitted from cathode

Anode surrounding the cathode attracts the electronsAnode surrounding the cathode attracts the electrons

Electrons take circular pathElectrons take circular path


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Induction coil wrapped around the lampInduction coil wrapped around the lamp

Screen cage surrounds the lamp to reduce EMI emissionsScreen cage surrounds the lamp to reduce EMI emissions

Operates at 27 WOperates at 27 W

Efficiency is 37lm/wEfficiency is 37lm/w


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Operating at 2.65 MHZOperating at 2.65 MHZ

Available in three wattages-55w,85w and 165wAvailable in three wattages-55w,85w and 165w

Shaped standard incandescent lampsShaped standard incandescent lamps

100,000 hr average rated life100,000 hr average rated life


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Lamp power is 23w at 48 lm/w

Up to 15,000 hours of rated life


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Consists of pyre x glass tubeConsists of pyre x glass tube

Operating frequency is 250khzOperating frequency is 250khz

Minimizes problems associated with EMIMinimizes problems associated with EMI

Ballast design is simpler than RF system at 2.65MHzBallast design is simpler than RF system at 2.65MHz


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Absence of electrodesAbsence of electrodes

Maintenance is lowMaintenance is low

It has instant and harmless startingIt has instant and harmless starting

Efficiency is highEfficiency is high

Control actions from remote places are easyControl actions from remote places are easy

The lamp luminous can be easily controllableThe lamp luminous can be easily controllable


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Cost is higher than fluorescent and incandescent lamps

With increasing frequency efficiency will decrease

If the frequency changes there are more problems withEMI

More complex design

Maintenance is not much easy


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Suitable for general lighting within a plant as wellSuitable for general lighting within a plant as well

as out door areasas out door areas

Economical choice for many plantsEconomical choice for many plants


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Great opportunity for increased durability, lightGreat opportunity for increased durability, light

output and efficiencyoutput and efficiency

Removes many of the lamp shape restrictions ofRemoves many of the lamp shape restrictions of

conventional electrode discharge lampsconventional electrode discharge lamps

radio frequency light sources presentation

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