Kabbalah su Salmi 19:9

From those seven ways, three are the shafts of the menorah from one side, the body and two arms of the king, They are "the mitzvah is light" (Prov. 6:23) to illuminate through them. And the other three shafts of the menorah from the other side are the legs and the covenant. And they are the "light from West" (Tamid 30b) to illuminate through them. This is called the Menorah of the King, and this is the light which illuminates the light of the mitzvah, of which it is said "the mitzvah of Ad-nai illuminates the eyes" (Ps. 19:9).