ahh im sooo glad you all asked!!! very very interesting experiment i have done, and still am studying today!
i cut off the lower nodes to promote upper node/bud growth, i have done experiments with this and it helps sooo much to cut out those little (sucker) nodes that arent going to be getting much light below the canopy. they quite literally suck the energy from the plant that could be used to help out those bigger nodes closer to the light/sun.
ive also been doing experiments by cutting the node and leaving the fan leaf intact/ also cutting the fan leaf and leaving the node intact.
one plant i started i cut one fan leaf off of one side of a node, and holy shit the node with the fan leaf intact by the end of the grow was at least double the size of the other node without the fan leaf intanct.
one time i had two plants of the same strain, the one plant i cut off all of the sucker nodes/the other i cut off JUST the nodes leaving all of the fan leaves. at harvest time the plant without any nodes or fan leaves had buds at least 25% bigger.
the only thing i can come up with so far in my experimenting is that not only do fan leaves gather energy for the plant, they also use energy to stay alive... if the plant can bypass that node bringing food'n micros up to the top of the plant.. to me it seems that without the fan leaf or node the energy can bypass that section and go to more productive growing sites on the plant.
it seemed to me like the plant with all the fan leaves intact was trying harder to keep those fan leaves alive/ when i personally would rather have that energy spent on other plant parts.
now the plant i cut the fan leaf off one node, and left the other alone. i think that if you cut the fan leaf without cutting the node you are going to decrease the amount of energy that budsight will be able to get, it will only be able to gather energy from the leafs the flowers create.
remember everything i say is not based on fact, just personal experimentation and experience... word up