One of my T12 96" fixtures ballast died. I Replaced it with a T8 96"
electronic ballast and reconfigured the wiring per the diagram. Put in
T8 bulbs and they lit but are dimmer in the center 1/3 than on the ends.
Any ideas why this should be?
He ended the job as he began it; fired
Make sure the solid state ballast is grounded well. At least one screw (or
wire) from the ballast to the metal fixture. Check the MA (milliamp) rating.
If for example the new T8 ballast is for 800ma bulbs, and the bulbs are
actually 1500ma, it can cause this type of problem.
Good luck & let us know what you find!
How long have they been in service? Certain ballasts and tube
combinations seem to require a beak-in period.
Personally, I like 48" T8's. They have been the most reliable set up I
could find. They fire up in cold weather, are brighter in the cold,
last longer than T12s, work with only one tube in a 2 tube fixture,
ballasts last longer and failure is *by far*, less catastrophic. No
leaking goop or exploding cases.
Tom in KY, a licensed master electrician for many stressful years.
You're right! They worked better the second day. Also I checked the
grounding and the fixtures were not grounded, so I fixed that.
As for 48", I didn't want to replace the fixtures, just the ballast as
they go out.
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