I agree with ditching the ballasts.
About 7 years ago I replaced all my garage and basement 4' T12 florescent tubes with LED tubes (110v)
I haven't had a lick of problem with any of them. They are super bright and turn on instantly ...
I think I went with 5 or 6000K ... whatever "daylight" color is....
you don't want to go too high in temp color or they have a blue tint... I'm sure you have seen cars going down the road light that.
but I digress...
Anyway, It's an easy swap.
Cut the wires to the ballast ..... either remove them or just leave them.
Wire 110v directly to the tombstones per directions.
DONE.
I wrote "110v" in black marker on the bottom of the housing..... just in case I have a brain fart I won't knock myself for a loop.
Not only are they brighter, they will save electricity also. Those old oil filled ballasts are power hogs.
The old ones have big capacitors in them.