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Relationship with ballast and fluorescent light

Relationship with ballast and fluorescent light

Relationship with ballast and fluorescent light

(OP)
Currently, I’ve 100 4-lamps T8 fixture in our facility and given out very high footcandle. So I want to reduce the number of T8 lamp per fixture from 4-lamp to 3-lamp. In general, do I need to shop for new ballast if I do that?

Thanks!!

RE: Relationship with ballast and fluorescent light

Yes.

RE: Relationship with ballast and fluorescent light

Actually, you probably have two separate two-lamp ballasts in the luminaire.  If you take one lamp out and the other goes out, that will verify.  If this is the case, you can drop down to two lamps just be removing the lamps.  But to run three, you'd need to replace one of the ballasts with a single-lamp ballast.  

RE: Relationship with ballast and fluorescent light

(OP)
Thanks guys. But aren't they running in parallel so that other lamps could keep on even though one lamp has been take out? I'm confuse, please help.

RE: Relationship with ballast and fluorescent light

What happens when you take one lamp out?  If you haven't tried yet, why are you posting?

RE: Relationship with ballast and fluorescent light

(OP)
I'm not on the site that's why I couldn't do the experiment. Thanks

RE: Relationship with ballast and fluorescent light

There are multiple possibilities as there are multiple types of ballasts.  There are ballasts for a specific number of lamps and there are ballasts for a range of multiple lamps.  No right answer is possible from a distance if you don't know what you have.

RE: Relationship with ballast and fluorescent light

It depends on the ballast.   

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