As mentioned previously to DerbyDad, I ordered 40 of these LED
replacements for fluorescent tubes.

http://amzn.to/2h5hwDj

They arrived yesterday. Today I decided to relamp two, four tube
fixtures. So far, I am thrilled with these tubes. 2500 lumens at
6000 degrees Kelvin, these tubes are very bright and come very close
to daylight.

Installation was very easy, I could have simply put them in the
fixtures with the existing ballasts, but I wanted to get rid of the
ballasts as they were old and in need of replacement.

A really nice feature of these tubes is, you can use fixtures with
either shunted or non-shunted tombstone connectors. Hot connects to
one end of the tube and neutral to the other end. I simply cut out
the ballasts, stripped the wires from either end of the fixture,
bundled each side's wires together and connected one side to black and
one side to white.

These two relamped fixtures give me more usable light in the barn /
shop / stables than three good condition normal fluorescent fixtures.

Now to get my great grandson to convert the other eight fixtures.