Build your own HID-Ballast - Page 8

mathias · 3rd April 2005, 07:40 PM

High Voltage spike in every half cycle ? Where does it come from ? You must shortcircuit the core ballast a little while to get a high voltage spike, this is the way the igniter work. The igniter stop working when the voltage drop across the bulb/fluorescentlight. When the igniter not is working, there are no other parts that can give a voltage spike. I have never read something about the need of a high voltage spike when the bulb is running, not yet anyway.

When the bulb was new the voltage was 96Volt and the current 1.6-1.7A and that seems right to me. I know that other discarge lamp will rise it´s running voltage when they get older, for instance HPS will rise it´s voltage with 170%.

A oscilloscope would be nice !

pinkmouse · 3rd April 2005, 08:11 PM

As I've said many times before, discharge lamps are very delicate, and misuse can cause them to explode. This includes incorrect current and voltage. Not to mention the fact that different ballasts may not be balanced leading current hogging and melt down. So I'm closing this thread.

3rd April 2005, 08:11 PM	#72
pinkmouse diyAudio Moderator Join Date: Apr 2002 Location: Chatham, England	As I've said many times before, discharge lamps are very delicate, and misuse can cause them to explode. This includes incorrect current and voltage. Not to mention the fact that different ballasts may not be balanced leading current hogging and melt down. So I'm closing this thread. __________________ Al The miracle is not to fly in the air, or to walk on the water; but to walk on the earth. Chinese Proverb

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3rd April 2005, 07:40 PM	#71
mathias diyAudio Member Join Date: Mar 2003 Location: Sweden	High Voltage spike in every half cycle ? Where does it come from ? You must shortcircuit the core ballast a little while to get a high voltage spike, this is the way the igniter work. The igniter stop working when the voltage drop across the bulb/fluorescentlight. When the igniter not is working, there are no other parts that can give a voltage spike. I have never read something about the need of a high voltage spike when the bulb is running, not yet anyway. When the bulb was new the voltage was 96Volt and the current 1.6-1.7A and that seems right to me. I know that other discarge lamp will rise it´s running voltage when they get older, for instance HPS will rise it´s voltage with 170%. A oscilloscope would be nice !

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