Author Topic: can someone please explain the differwences in starters?  (Read 421 times)
Walter Knox
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can someone please explain the differwences in starters? « on: April 09, 2021, 10:31:41 PM » Author: Walter Knox
okay, so I know the difference between the FS-2 and FS-4 and FS-5 starters. my question is the FS-2 FS-22 and FS-25. from what I can understand the FS-22 is for a 22 watt circline lamp, the FS-2 is for 14,15 and 20 watt lamps and the FS-25 is for 18,20 and 25 watt lamps. but from what I have seen they all work interchangeably. I have a 22 watt circline fixture that has an FS-2 starter in it because i did not have an FS-22 and it works fine, I have seen FS-22 starters on 15 watt aquarium lights that came that way from the factory. last week I was helping my uncle with his crab cage light because it was out, it is a 25 watt lamp, the starter that was in it was a standard FS-2 and it was that way from the factory. worked fine for almost 12 years on a timer every day. we got the FS-25 starters because that is supposedly what a 25 watt lamp needs, and it worked fine. but it was a pack of 2 so i took it home to play with and just as i thought the FS-25 worked just fine for a 15,20 and 22 watt lamp. so my question is if the FS-2, FS-22 and FS-25 all work interchangeably and the lamp and starter life does not seem affected by using the incorrect one, what is the difference or purpose of having the different types?   
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Foxtronix
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Formerly "TiCoune66". Also known here as Vince.


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Re: can someone please explain the differwences in starters? « Reply #1 on: May 09, 2021, 02:02:04 PM » Author: Foxtronix
My memory is kind of rusty when it comes to fluorescent stuff...

But if I remember correctly the gas bulb inside FS-4s and FS-12s need around 200V to ignite, while all the others can ignite off mains (open circuit) voltage, so they're pretty much interchangeable. Same thing for FS-4s and FS-12s.
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