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SBH[_4_] SBH[_4_] is offline
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Default Replace T12 fluorescent bulb with T8 bulbs?

If the ballast is not a T8 ballast, it will not work. You need a T8 ballast.

My guess is since the fixture already contained T12 lamps, the ballast isn't
for a T8. Therefore, you'll need to change the ballast.