What's the Visible Light and Invisible Light?

The spectrum of visible light refers to the light waves that the human eye can see. It is present in the sunlight and makes up the colours of the rainbow. High-energy visible light wavelength ranges from 390 nm to 700 nm.

UVA and UVB light from the sun are invisible to the human eye. But they are most definitely felt by your eyes and skin, especially during the daylight hours. Even in the winters when the sun is low, these lights are doing their work. Where UVB causes sunburns, UVA penetrates deeper and damages your skin from within.

The wavelengths of HEV(High Energy Visible) light coming from the sun or your electronic devices range from 380 nm to 500 nm. It includes the most dangerous range of blue light wavelengths i.e 400 nm - 450 nm. It has a number of purported negative biological effects, namely on circadian rhythm and retinal health (blue-light hazard), which can lead to age-related macular degeneration.