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Because the Sun feeds plants, is the main cog in the clockwork of the Solar System, and because without it most life on Earth would shrivel up and die, sunlight must have some magical healing properties that science isn't already aware of. The term light woo (or heliotherapy) can be applied to any pseudoscience, magical thinking, or woo beliefs centered around artificially created light or natural sunlight.
Through the process of nuclear fusion, the Sun releases radiation across most of the electromagnetic spectrum (except gamma rays) which then gets filtered through the Earth's atmosphere. The ozone layer filters out some of the ultraviolet (UV), but not all of it. Sunlight facilitates the synthesis of vitamin D in most mammals (which occurs from exposure to UV radiation) and fuels photosynthesis in plants. Due to the risk of cancer from prolonged sunlight exposure, the Institute of Medicine doesn't set a recommended minimum level of exposure.[1]
The Faroese physician Niels Finsen (1860-1904) reported in 1896 that intense light was an effective treatment of lupus vulgaris (tuberculosis infection of the skin), a discovery for which he was awarded the Nobel Prize in Physiology in 1903. His method was later replaced by treatment with anti-tuberculosis drugs. Today it is believed that the anti-bacterial effect did not come from the light itself, but from the irradiation generating highly active oxygen species (similar to peroxide), which are toxic to bacteria.[2]
There is evidence that targeted UVB light exposure is an effective treatment for psoriasis.[3][4] A common treatment for seasonal affective disorder is "full spectrum" light exposure, although the term "full spectrum" when applied to electrical lighting is a bit of a misnomer,[5] there's some evidence that light exposure performs better than a placebo.[6]
In photodynamic therapy, the patient is given a phototoxic medication, and high-intensity light, usually laser light, is shined on a target area to kill cells there. It is a targeted form of chemotherapy for cancer and various other diseases.[7] Phototoxins are excited into a higher energy state by the light, and transfer the energy to molecular oxygen (O2), which is excited into singlet oxygen. Singlet oxygen is an indiscriminate but short-lived strong oxidizer and is cytotoxic, killing the cells in the target area.
Genesis chapter 1 recounts the early existence of darkness (Genesis 1:2), followed by the creation of light (Genesis 1:3),[10] followed by the distinction of light from darkness (Genesis 1:4), and to cap it all, 3 days later, the provision of sources of light - stars, etc (Genesis 1:14-18). So light obviously has some sort of association with Strong Magic from the get go.