Replacing fluorescent 2x4 fixtures with LED...which approach?

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Cary wrote:
[quote=Bill in NC]
#1 only works if you already have T8 tubes/ballasts, not the older T12.

So I vote for #3.

This is not correct. You can replace either T8 or T12 bulbs with LED tubes.

I vote for cutting out the ballast and changing the tombstones. I've done this on a bunch of fixtures - only takes a few minutes.

#2 may, and #3 will require new dropped ceiling panels and maybe crossbars, which may or may not match whet you've got there.
Cary is correct. I just checked, and the empty Feit LED box the tubes came in says nothing about ballast type or T12 or T8. I pulled out T12 FL tubes with an unknown ballast, the the Costco/Feit tubes are AWESOME!