Numerous studies have already determined that exposure to blue light from screens and LED lights is biologically and environmentally harmful (see 1, 2, 3, 4, 5, 6, 7, 8, 9, 10).  Another one recently revealed much of the same.

Dangers from blue light exposure worsens with age: 'Detrimental to human health'

CORVALLIS, Ore. — Constant exposure to blue light from phones and computers is very harmful to people. Researchers from Oregon State University say the damaging effects of daily, lifelong exposure to blue light worsen as a person ages.

Natural light is critical for a healthy circadian rhythm, which is important for a person's eating and sleeping patterns. However, being constantly subjected to blue light disrupts sleep and causes circadian disorders. Jaga Giebultowicz, a researcher in the OSU College of Science who studies biological clocks, notes people are exposed to increasing amounts of light in the blue spectrum because LEDs emit a high fraction of blue light.

"This technology, LED lighting, even in most developed countries, has not been used long enough to know its effects across the human lifespan," says Giebultowicz in a university release. "There are increasing concerns that extended exposure to artificial light, especially blue-enriched LED light, may be detrimental to human health. While the full effects of blue light exposure across the lifespan are not yet known in humans, accelerated aging observed in short-lived model organism should alert us to the potential of cellular damage by this stressor."