Author Topic: Self-ballasting a 125W Mercury lamp.  (Read 2693 times)
Foxtronix
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Self-ballasting a 125W Mercury lamp. « on: November 16, 2008, 03:57:13 PM » Author: Foxtronix
How many incandescent should I use? And what wattage?
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Lampenfreak
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Re: Self-ballasting a 125W Mercury lamp. « Reply #1 on: November 24, 2008, 02:32:12 PM » Author: Lampenfreak
Hello you need a lot more watts :P. If you don't know I show how to get the right wattage.

1st: R=U/I=125V/1.15A = 109 Ohm
2nd: P=U^2/R=(120V)^2/109Ohm = 132W
at 1st: U...burning voltage; I...burning current
at 2nd: U...main voltage (120V US, 230V Europe)

That is an easy way to make your own self-ballasted mercury.

So I hope to helped you ;)

Michael
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Foxtronix
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Re: Self-ballasting a 125W Mercury lamp. « Reply #2 on: November 29, 2008, 10:56:56 PM » Author: Foxtronix
Thanks Lampenfreak! But I tried with the closest wattage (130W, then 135W) and it didn't work...
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Foxtronix
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Re: Self-ballasting a 125W Mercury lamp. « Reply #3 on: December 08, 2008, 05:40:05 PM » Author: Foxtronix
Since I live in Canada, we use 120V. Anyway I run it on an H39 ballast instead.
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arcblue
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Re: Self-ballasting a 125W Mercury lamp. « Reply #4 on: December 10, 2008, 03:28:46 PM » Author: arcblue
I run my 125w MV on a 100w H38 yard light ballast. A number of these, such as mine, actually run a 100w lamp at about 115w - in fact the replacement lamps by Regent even say "100w-125w mercury vapor." The lamp runs fine although is a little underdriven, arc tube is still perfectly clear and ballast runs cool and I have used it a lot.

True 125w ballasts are hard to find in North America but they do exist.
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