Need some clarification here to help as I have installed many ballast compatible and bypass LED tubes. You say that you got plug and plays and they were very dim. So you then bypassed the ballast, did you then change to LED bypass or still using the ballast compatible bulbs? I only ask because they are not one in the same. The ballast compatible "plug and play" led tubes are only for use with a ballast and if you ballast is bad that could have been the issue not the bulbs. On the flip side ballast bypass bulbs require to to direct wire the fixture and remove the ballast and will not work if it is still in there. Just need that clarification to help you a little more.