Light waves

. The use of light, especially ultraviolet light, to treat medical conditions is known as "phototherapy". Natural sunlight has been recommended by holistic science in restoration of vitamin D balance, and seasonal affective disorders or 'SAD' for many years, but it is now known that it is the ultraviolet part of the radiation produced by the sun that is used in phototherapy, in particular the ultraviolet A (UVA) and ultraviolet B (UVB) wavelengths.  . Also that red light which easily penetrates the dermis is being used to help with a variety of skin conditions, such as acne, rosacea, scarring and eczema, as well as improving skin quality.  . 'We must of course caution against overexposure to 'sunrays' for obvious reasons'. Now then, Full-spectrum light is light that covers the electromagnetic spectrum from infrared to near-ultraviolet, or all wavelengths that are useful to plant or animal life; in particular, sunlight is considered full spectrum, even though the solar spectral distribution reaching Earth changes with time of day, latitude, and atmospheric conditions.  . The idea of healing using light energy sounds very "new-age", but the medical profession is beginning to understand that there is an incredible healing power hidden within the light spectrum.  .  . We know today that man is essentially a being of light, and the modern science of photobiology is presently proving this. In terms of healing, the implications are immense. We know, for example, that light can initiate, or arrest, cascade-like reactions in the cells, and that genetic cellular damage can be virtually repaired, within hours, by faint beams of light. We remain at the threshold of fully understanding the complex relationship between light and life, but we can now say, emphatically that the function of our entire metabolism is dependent on light.  .