The reverse is the case with regard to the lights since the order of the lights is that the lower ones enter the partzuf first. Initially the light of nefesh enters the partzuf, then the light of ruaḥ, then the light of neshama, then the light of ḥaya, and then the light of yeḥida. Thus, the light of nefesh enters first, which is the light of the vessel of Malkhut, the smallest of all the lights, and at the end, the light of yeḥida enters the partzuf, which is the largest of all the lights. Consequently, we list the lights in the order of nefesh, ruaḥ, neshama, ḥaya, and yeḥida, that is, from lowest to highest, since that is the order of their entrance into the partzuf.
Why the Lower Lights Enter the Partzuf Before Higher Ones
Introduction to Sulam Commentary 10:2