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LED lights – the science

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LED lights – the science

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Written by: Kathryn Danzey

Light is described by its wavelength (measured in nanometers or nm) which actually determines its colour.

There are a lot of shades of colours within the visible spectrum, this is what we see as the rainbow.  Other wavelengths exist, ultraviolet is a lower wavelength than the visible spectrum and infra red is above the visible spectrum.  These wavelengths are not visible to the human eye but still make up the spectrum of light.

The diagram shows that UV (Ultra-violet) light exists below 400 nm and that IR (Infra-red) light exists above 900 nm .  The visible spectrum start around 400 nm (blue) to around 760 nm (red).

Ultraviolet     <—————– visible light ———————>   infra red






The greater the wavelength, the deeper it penetrates, so ultra violet is very superficial, it is the part of the spectrum that tans our skin – infra red is a much deeper light.

Skin cells have the ability to absorb visible light and use the energy for repair and renewal.


About the Author

Kathryn Danzey
I have a passion to bring to you what really works in the beauty industry, from a moisturiser to the latest advanced treatment for anti ageing. After almost 4 decades in the industry I'm packed with info to share but never tire of looking for new things and would love you to share your experiences with us too. We're here to help you find that treatment or product that will make a change for you. Can't do without My Collagen Shots and H3O Night Repair. Love a great serum and UV protection

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