The S'firot(Light) along with any 'garment' it is connected to was never intended to be an object of study separate from the context in which it arose, namely an instrument in the government of the worlds, under the rulership of the Divine. One of the problems is that many would be magicians, instead of realising that the invoking of the Divine force is a prerequisite to summoning a spirit to appearance, tend to rush past this and focus on what they think is more interesting, namely the appearance of the spirit. Now this is idolatry, but it isn't simply a matter of obeying the Orthodox Jewish ruling concerning the mitzvot. In the deepest sense, it is impossible not to be involved in idolatry at some level. The goal is to understand this and move closer to the Divine. The names and images of these demons, spirits etc are worthless for reasons that make sense to anyone who understands the nature of the texts.
Those traditional Kabbalists who spent more time with these systems understand the dangers...mistaking something for which it is not. The most obvious example is the belief that you can know something in its essence. The faculty of imagination is the biggest stumbling block further along the path in this respect. Another example is believing that there is another power in the world, namely Klipot(shells), or that by one's own authority one achieves a particular end. The Quabalah of Crowley, Blavatsky, Mathers et al, was linked to a far broader program of spiritual correspondences and religious synthesis, to have allowed the deepest aspects of Kabbalah to come out. Indeed, it is only in the last few years that many translations and writings have become available. However, the fact remains that the majority of western students, without any real knowledge of Kabbalah, Hebrew and Torah, are attempting to use a system that simply is defeating the very purpose for which it was intended, originally. I am not speaking purely theoretically either. Even books of Quabalah that address some of the more historical aspects of Kabbalah, such as J Bonner's 'Quabalah, a magical primer' fall short of providing any real understanding of the four worlds etc. They simply repeat a list of correspondences that has absolutely nothing to do with the relationships that the S'firot express in terms of Man's purpose.
The Inner significance of idolatry focuses on the subtle awareness of the individual as he/she rises and falls in accordance with the Ladder. These energies reveal the method by which one is concealed from the Light of G-d, and therefore one is forced to relinquish that state for another. These are the demons and spirits that 'conceal' or garb the S'firot. They do not require any other summoning, other than the left line which presents itself day to day
in every thought and emotion that separates you from your 'neighbour', friend, humanity. Anything, that appears to sustain this separation, although having a divine function, is idolatry and the path to correction.