Ignition of HID on electronic gear

Topics relating to lighting control gear, including magnetic & high frequency ballast and ancilliary devices such as starters, ignitors and switchgear.
frutas
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Ignition of HID on electronic gear

Postby frutas » Tue Sep 27, 2011 11:04 pm

I've just been messing around over the last few days running CDM-T lamps on electronic and magnetic gear and have noticed that there is a massive difference in ignition of the lamps.

On electronic gear the ignition seems very hit and miss sometimes only starting up quite a few seconds after switch on yet instantly at other times. On one occasion it even ignited went out after a second then came back on a few seconds later.

Magnetic is a little more flikery, but more reliable and shows signs of working instantly!

It seems harder to ignite a new 70W CDM-T elite lamp from Philips.

So maybe yet another downfall of electronic gear here?

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sailormoon01uk
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Re: Ignition of HID on electronic gear

Postby sailormoon01uk » Wed Sep 28, 2011 8:01 am

Hi

the Igntion of Discharge Lamps on Electronic is Timed Pulse, example it strikes a 4.5kv pulse for 2 seconds the stops,then again, afeter a certain time I think 10 seconds if the still hasn't struck, the ballast will shut the ignitor circuit off and will remain off until the power is switched off, also with Electronic Ballasts, they run the lamp smoother than a Magnetic Ballast example with a metal Halide LAmp if there is a voltage Fluctuation in the Mains it can Explode when lit on a magnetic Ballast as it doesn't eliminate the Voltage Change whre a Electronic Ballast will maintain the Lamp Voltage and current constantly.

With a Magneitc Ballast and Ignitor, this produces a continous pulse from 2300 volts to 5000 volts (except for the SOX, Philips HPI-T and Venture HIE/HIT-EURO lamps they strike at around 1000 volts), so if the is classed as a failed Lamp on Electronic Gear it will strike happilly on a Conventional Magnetic Ballast and Ignitor Circuit. however you can bet Timed Ignitors, they work the same way as a standard Ignitor, exept they shut of after a few minutes, which has the benefit of switching off the High Voltage Pulse running theough the Lampholder or in the case of the three wire Impulse Ignitor, reduced the stress on the Ballast. Also there is a Issue with Metal Halide Lamps on Conventional Ballasts/Ignitors if there is a change in the Mains Voltage, (Fluctuating), this can cause the Lamp voltage and Current to rise Dangerously, and have known caused the Metal Halide Lamps to Explode Violently.

All the Best

Colin

Lampwizard
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Re: Ignition of HID on electronic gear

Postby Lampwizard » Wed Sep 28, 2011 1:35 pm

This is common behavior; a CDM lamp will not always take over immediately after an ignition voltage pulse when driven by an electronic ballast. But most customers/end-users don't care about the lamp's start-up delay which can be several seconds: there's not much light anyway for the first two minutes or so when the lamp is running up....


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