The reason why I would like to start with red 250w is because I already have that at home. Later I will probably buy the one you suggested. At 60cm is not much overheating, at this distance I feel similar pleasant heat as if I am under the sun. 15cm yes it is too close and it is burning, but 30cm could be tolerated. At 30cm the skin is hot, but not burning at not very uncomfortable. Anyway I have no idea if 30cm distance is close enough or too far to get enough positive changes.
Keep at the distance that feels best for you, there is thermal benefits from these lights.