When this is done by typical New Age focused participants, it will do nothing to provide personal protection. This will only have value if the intention held within the mind and heart is to summon the holy white light of the divine specifically. The idea of source energy and white light having special powers is a New Age notion that is devoid of true spiritual intent because it is a deception and a diminishment in not recognizing its origin as being truly holy and associated with the Creator of All That Is. In the absence of that recognition specifically, white light in and of itself is only electromagnetic energy. It has a consciousness, but of a limited sort, and will not have an awareness nor interest in doing any useful work for human beings other than to the extent it provides a medium for perceiving things in the environment courtesy of the vision apparatus built into your physical being. So this is a self-deception to think surrounding oneself with white light alone has any value.