Correct Capacitor List

Topics relating to lighting control gear, including magnetic & high frequency ballast and ancilliary devices such as starters, ignitors and switchgear.
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Slyspark
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Correct Capacitor List

Post by Slyspark » Thu Aug 20, 2015 4:05 pm

Just wondering if anyone has a nice list / chart that shows the correct capacitor ratings for fluorescent / SOX / SON / Halide / MBF lamps on Magnetic ballasts as not all gear has the capacitor requirements sown on it. Would make a handy reference if anyone has one they'd be willing to upload?

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Re: Correct Capacitor List

Post by Tom » Thu Aug 20, 2015 4:39 pm

Off the top of my head caps are as follows; (Don't ask me how I remember, too many years with my head in the catalogues/inside fittings LOL) :rofl :doh
250v caps;
2uF = 4-13w T5, PL-S, 16w 2D
3-4uF = 18" 15w through to 4' 40w, 2D 28-38w, PL-L
5.5-6uF = 5' 58w/65w and 6' 70/75w, 50w MBF, 35-55w SOX? 4' 40w SRS?
8uF = 2' 40w, 5' 80w, 6' 85w, 80w MBF
8.4uF = 8' 100w ballast and starter switch. Upon switch-on, the starter closes and preheats the tube's cathode filaments. Upon opening, the magnetic field within the ballast collapses, causing a voltage pulse which strikes the tube. This is often repeated twice or more, causing the distinctive blinking at startup.">switchstart lagging, 5' 65w through 8' 85w SRS
10uF = 70w SON/MH, 125w MBF

440v;
5uF = 6' 70/75w lead
7.2uF = 8' 125w lead
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Re: Correct Capacitor List

Post by Slyspark » Thu Aug 20, 2015 4:51 pm

Cheers!

Don't spose you have any ideas on 250w mercury at all?
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Re: Correct Capacitor List

Post by Tom » Fri Aug 21, 2015 12:09 am

13uF for the 250w MBF circuit. Take a look at the old Thorn catalogues we have posted in the gallery. Fully detailed gear and circuits sections are superb!
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Re: Correct Capacitor List

Post by Slyspark » Fri Aug 21, 2015 3:22 am

Cheers Tom,

It's funny, but I had that idea earlier, spent ages trying to find the one I wanted, but did eventually find it and was able to light the fitting I wanted to. I meant to post here that I'd found it....

Might take some time to compile a list of all the capacitor sizes from there, I'd certainly find it usefull and I'm sure others might too. If I do do so, I'll post it on here somewhere. Old control gear always used to state the capacitor size on it, but none of the more modern stuff seems to any more - odd....
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Re: Correct Capacitor List

Post by LinearSLI-H » Fri Aug 21, 2015 8:26 am

I have done lists on here for total HID/Fluorescent circuit watts and lumen figures, I could do one using the army of manufacturers catalogues I have, but it takes ages, and my other two lists are buried deep within the archives somewhere, which is not that readily accessible to find, but its easier to just ask for which one is needed like you did here :D
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Re: Correct Capacitor List

Post by versalift09 » Sun Sep 06, 2015 8:17 pm

Add to that list:
12uF for 100w SON
20uF for 150w SON
30uF for 250w SON
40uF for 400w SON

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Re: Correct Capacitor List

Post by Paul » Mon Sep 07, 2015 5:10 pm

@Rich - are they in the forums somewhere or the gallery?
If you like I am more than happy to make them a PDF and put them in the technical reference area on the gallery....

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Re: Correct Capacitor List

Post by LinearSLI-H » Mon Sep 07, 2015 5:49 pm

Yeah, their in the forums somewhere, if I remember their under lamps and not gear?
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Re: Correct Capacitor List

Post by Paul » Mon Sep 07, 2015 6:25 pm

First PDF file.... Fluorescents
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Capacitor Table Fluorescent.pdf
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Re: Correct Capacitor List

Post by Slyspark » Mon Sep 07, 2015 9:45 pm

Ah, that's brilliant! I was going to make one, but that's perfect! Cheers!
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Re: Correct Capacitor List

Post by Paul » Mon Sep 07, 2015 10:54 pm

Not a problem! I will be doing one for discharge too.

If you look at page 312 in the Thorn 1976 Catalogue, there is a table in there! :doh

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Re: Correct Capacitor List

Post by Paul » Thu Sep 10, 2015 12:32 pm

Here's one for discharge circuits....
@Davy... the value for 400w SON seems to be different to the one you have listed. Is this down to a different circuit or gear?
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Capacitor Table Discharge.pdf
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Re: Correct Capacitor List

Post by MissRiaElaine » Sun Aug 13, 2017 7:31 pm

Paul wrote:Here's one for discharge circuits....
I have 20μF listed for my 35W SOX lamp, data from this site.
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Re: Correct Capacitor List

Post by MFL » Wed Oct 04, 2017 6:42 pm

Here is the list from Vossloh-Schwabe capacitors
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image.png
image.png

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Re: Correct Capacitor List

Post by Tom » Wed Oct 04, 2017 7:03 pm

I do find it quite interesting the huge contrasts in different capacitor ratings between lamps, even of the same wattage. We have 13-18uf caps for 250w mercury circuits yet the 250w SON needs 30uF! Old catalogues from the 50s, for say, a 4ft 40w ballast and starter switch. Upon switch-on, the starter closes and preheats the tube's cathode filaments. Upon opening, the magnetic field within the ballast collapses, causing a voltage pulse which strikes the tube. This is often repeated twice or more, causing the distinctive blinking at startup.">switchstart circuit list a 3.25uF cap yet an 18" 15w circuit was 4.5uF? Goes to show just how much ballast characteristics have changed over the years and indeed, how much they vary between manufacturers!
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Re: Correct Capacitor List

Post by MFL » Tue Apr 24, 2018 6:15 pm

Capacitor ratings varies with voltage, total energy consuption (a low loss ballast could have a different rating from an old ballast) and the supplied lamp technology. I also found that some capacitor ratings are almost impossible to find in my local suppliers (for examples : 2µF/250V, 3,6µF/480V)

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Re: Correct Capacitor List

Post by MissRiaElaine » Wed Aug 29, 2018 10:20 pm

Paul wrote:Here's one for discharge circuits....
@Davy... the value for 400w SON seems to be different to the one you have listed. Is this down to a different circuit or gear?
In the Thorn catalogue I looked at, it shows 2 x 25µF i.e. 50µF for 1000W MB/MBF, I didn't have those so used 1 x 20µF and 1 x 30µF, don't suppose it's critical how the value is made up.
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Re: Correct Capacitor List

Post by MissRiaElaine » Wed Aug 29, 2018 11:52 pm

MFL wrote:Here is the list from Vossloh-Schwabe capacitors
That lists 20µF for a 35W SOX lamp, yet other lists I've seen show 8µF. I am officially confuzzled.
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Re: Correct Capacitor List

Post by Tom » Fri Aug 31, 2018 10:45 am

Re the 35w SOX circuit, I believe the 20uF cap applies to the autoleak transformer ballast which is a magnetic beast and the 6-8uF applies to the modern slim ballast and ignitor setup.
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Re: Correct Capacitor List

Post by MissRiaElaine » Fri Aug 31, 2018 12:10 pm

Tom wrote:Re the 35w SOX circuit, I believe the 20uF cap applies to the autoleak transformer ballast which is a magnetic beast and the 6-8uF applies to the modern slim ballast and ignitor setup.
Could be, the Philips L4045 ballast I have for 45/60/85W SOX lamp, which had to be burnt only in the horizontal position.">SO/H or SOI/H lamps specifies 13µF so I suppose it all depends on the actual ballast used rather than purely lamp wattage.
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