Mark, as Hetty said, there won't be any shock at all (they are just "sticks") since there are no roots. People root their plumeria in everything from 100% perlite to 100% soil. Everyone seems to have their favorite way of doing so. The main thing, regardless what you use, is to have that rooting-medium dry so that your stems won't rot. Until they are rooted, these plants rot pretty easily since they have no way to utilize moisture. I guess I am trying to get across that there is no One Way to root plumeria.
I can't tell you whether the heat generated by those 4 T-5 tubes will do the trick. Someone who roots under lights will have to help you there.
