Author Topic: Why the British 125W T12 requires a capacitor for optimal lamp performance?  (Read 626 times)
dor123
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Why the British 125W T12 requires a capacitor for optimal lamp performance? « on: June 12, 2022, 10:17:52 AM » Author: dor123
The question is at the title.
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Re: Why the British 125W T12 requires a capacitor for optimal lamp performance? « Reply #1 on: June 12, 2022, 03:56:18 PM » Author: funkybulb
 It due to arc voltage of british 125 watt lamp.   The arc voltage is
145 volts and high reignition peak of the lamp meaning lamp will not stay lit on series choke with out any help. As u need twice arc voltage with the choke about 300 OCV.  So cap change phase angle
 to keep the lamp lit on lower OCV.
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dor123
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Re: Why the British 125W T12 requires a capacitor for optimal lamp performance? « Reply #2 on: June 13, 2022, 06:52:32 AM » Author: dor123
Thanks.
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I only working with the international date format (dd.mm.yyyy).

I lives in Israel, which is a 220-240V, 50hz country.

108CAM
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Re: Why the British 125W T12 requires a capacitor for optimal lamp performance? « Reply #3 on: June 19, 2022, 11:02:58 PM » Author: 108CAM
This actually helps me understand my F125T12 tube. I hope to be able to light it someday. I do remember reading that you can buy glow starters for the 125w tubes
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Re: Why the British 125W T12 requires a capacitor for optimal lamp performance? « Reply #4 on: June 20, 2022, 05:32:36 AM » Author: AngryHorse
They use to be the old Thorn lighting number 155/800, I think the newer ones are FS125s  :)
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