In an unpublished manuscript on photopherisis (The medical potential of ultraviolet light) regarding physiologic actions and effects of ultraviolet energy, it is mentioned that when UV ray's photoluminescense is absorbed by blood-stream, the effect is physical, then chemical and finally biologic. Photochemical reactions are initiated by change of electronic configuration and velocity. If the incident energy is short enough, it will produce vibrations in the electrons which will then be activated. These electrons may then be ejected and molecule thus ionised or they may be displaced to an outer orbit and then the atom or molecule is activated. Photoelectric phenomena are the basis of all the subsequent reactions.

The following reactions take place in the human body when the ultraviolet energy strikes it.
•    Calcium metabolism is profoundly improved by an increased blood content.

•    Bacteria in the body are killed by the direct action of the UV rays and indirectly by increased local and systemic resistance.

•    Toxins in the body are rendered inert.

•    Normal chemical balances in the body are restored.

•    Cellular imbalance in the blood is corrected if UV is administered in suitable doses.

•    Fat elements in the blood that were altered in character by disease are restored to normal size and Brownian Movement (Brownian Movement is the random movement of small particles suspended in a fluid caused by the statical pressure fluctuations over the particle).

•    Oxygen absorption is increased following UV irradiation of autotransfused blood.

•    The immune system is depressed, immune resistance to bacterial infection is lessened and the bactericidal potency of the blood is reduced with a fall in haemoglobin by an overdosage of UV.
Individuals vary greatly in their sensitiveness to ultraviolet irradiation regarding systemic and skin effects. Sensitivity to it
is cumulative.

The action of ultraviolet rays may be immediate, somewhat delayed, markedly delayed or protracted on any individual. Ultraviolet irradiation acutely illustrates the power of colour on all people.