This is a special application of the field of photobiology. Cell death can be induced in cancerous cells by making them photosensitive using a photosensitizing drug. This is referred to as photodynamic therapy where photons are used to treat a condition and it is not a recent event.
The light source determines the effect of light on health in general. Not only humans are sensitive to light. Almost all organisms are susceptible to light be it bacteria, protists, and algae, or multicellular organisms.
Animal behavior depends on light’s intensity so artificial lighting in wildlife needs to be regulated as otherwise, it can cause light pollution.
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