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5 comments
Active Contributor

Join Date: May 2011
Posts: 20

18W Fluorescent in Series

05/06/2012 3:18 PM

I'm working electricity for very long time but this series 2pcs 18W fluorescent tube with single choke 36W, using two starter makes me difficult to understand the wiring connection are correct as the orignal. Why its didn't start everything is okay the choke, tubes, voltage, and starter tried it is good, connection are zero ohms..but it didn't start unless you short one of the starter and put it a few seconds then release, one tube will glow then after you replace it with the good stater the 2nd tube also start to glow. If I will never understand how this thing works better use two 18W choke and wire it individually.

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#1

Re: 18W Fluorescent in series

05/06/2012 3:28 PM
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Guru
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#2

Re: 18W Fluorescent in series

05/06/2012 3:31 PM

Are you sure the starters are good?

Starters are difficult to measure, have you tried to start each of the separate bulbs with each starter one at a time to make sure you haven't just got a faulty starter.

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Guru

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#3

Re: 18W Fluorescent in series

05/06/2012 7:42 PM

Use of a single choke for both tubes does save some manufacturing cost. They are essentially connected in series, but each uses its own starter. The catch is that BOTH starters and BOTH tubes must be identical AND operational (and with not too much aging difference) for this scheme to work at all, so it's not universally used. S.M.

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Power-User
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#4

Re: 18W Fluorescent in Series

05/07/2012 4:57 AM

This is a method that is commonly used in commercial signs.

I guess the equation is something like one 36W ballast costs less than two 18W ballasts, and takes less time and material to wire up.

I have used this method myself from time to time. It can be a bit finickety to get going at first but seems reliable enough.

On a 230V supply, it is necessary to use 110 volt starters, and if our OP has changed out the starters without knowing this, that would account for the non-functioning of the light.

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#5
In reply to #4

Re: 18W Fluorescent in Series

05/07/2012 7:45 AM

Since the stater we have in stock are all 220/240V I've changed it using two chokes.

Yes this method is cost effective and simple to wire up.

Thank you for your reply now I knew it next time it would be easy for me to repair this kind of circuit.

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