What is HEV Light and why do we need to protect skin from it?

High Energy Visible Light (HEVIS Light) is all around us. It’s part of the light we can see. It’s been around for as long as UV rays, but while much has been written about their effect on skin, the molecular and visible effect of HEV Light on skin is a more recent discovery. Research proves that HEVIS light influences skin condition and can cause skin to photoage (age prematurely as a result of sun exposure). In this article we examine the effects HEVIS light has on skin, put it into context alongside UVA and UVB rays and consider how best to protect skin from photoaging.



The sunlight spectrum consists of UV, visible and infrared light. Visible light accounts for 50% of the sunlight spectrum and, as the name suggests, it’s the only part of light that can be detected by the human eye (UV and Infrared Light are both invisible).


The blue/violet band of this visible spectrum has a particularly high energy level and is known as High Energy Visible Light. This is often abbreviated to HEV Light or HEVL.

Sun spectrum visible light
50% of the sun’s rays are visible

How does HEVIS Light compare to UV rays?

Light is measured in wavelengths, the units of which are nanometers (nm) and millimetres (mm). Visible light has a wavelength range in the region of 400 to 760nm, with HEV light falling somewhere between the 400-500nm mark. UV light has a shorter wavelength (of between 290 and 400nm) though UVA has longer wavelengths than UVB.


The vast majority of skin damage caused by the sun comes from UV rays and protecting skin from UV should remain the priority when caring for skin in the sun.
sun spectrum: HEVIS light
HEVIS Light falls into the violet/blue band of the visible spectrum

Good in moderation

Sunlight can be good for us – it’s an important source of Vitamin D which is essential for healthy bones and it boosts our levels of serotonin, lifting our mood. But too much sun can damage skin. 

HEVIS Light and UV rays affect skin differently

While UVB rays penetrate the outermost layers of skin (the epidermis), HEV Light, like UVA rays, penetrates into the lower layers of skin (the dermis):


  • UVB rays are responsible for sunburn. HEVIS Light has not been associated with sunburn.
  • UVB rays and, to a lesser extent, UVA rays have been linked to DNA damage which can cause skin cancer.
  • Both UVA rays and HEVIS Light can cause skin to age prematurely (photoage).
  • UVA rays are the primary cause of sun allergies. UVB rays can also cause sun allergies, but to a lesser extent.
  • UVA, UVB and HEVIS Light can induce hyperpigmentation and may contribute to conditions such as sun spots (also known as age spots), melasma and post-inflammatory hyperpigmentation.

You can read more about the difference between UVA and UVB rays in ‘How do the sun’s UVA, UVB and HEVIS light rays affect skin?’ 

Sunlight spectrum: HEVL

HEVIS Light and premature skin ageing

Like UVA rays, HEVIS Light generates free radicals (also known as ROS – Reactive Oxygen Species). These free radicals cause skin cells to produce enzymes that break down the collagen and elastin that give skin its plump, youthful appearance. This process is often called oxidative stress and it’s what causes skin to photoage (age prematurely as a result of sun exposure).Aging is, of course, an entirely natural process, but when skin ages prematurely it may start to sag and develop deep wrinkles before its time.

HEVIS light and hyperpigmentation

Alongside UVA and UVB, HEVIS Light can induce uneven skin pigmentation (often referred to as hyperpigmentation) and may contribute to conditions such as age spots (also known as sun spots), melasma and post-inflammatory hyperpigmentation.


UVA, UVB and HEVIS Light rays all contribute to sun spots

It’s important to remember that the sun’s rays affect your skin even when the weather is cloudy and overcast. Sun care should not be restricted to those days when the sun is at its hottest, but should form part of your daily skincare routine.


When choosing appropriate suncare products, the priority is still to give your skin the very best protection against UVA and UVB rays, but choosing products that also combat the oxidative stress caused also by HEV Light will further help to prevent photoageing and may reduce hyperpigmentation.


Many modern sun creams and lotions offer effective protection against UVA and UVB rays, but the chemicals and pigments used to filter UVA and UVB do not filter HEV Light. For this reason, we recommend that you look out for products that contain antioxidants that work against oxidative stress. Antioxidants Licochalcone A and Glycyrrhetinic Acid have been proven to work together to protect skin cells in the deeper epidermal layers from sun-induced damage.

Eucerin Sun Fluid Anti-Age SPF30 and Eucerin Sun Fluid Anti-Age SPF50 have been proven to offer reliable protection from UVA and UVB rays and to combat the oxidative stress caused by HEV Light and all contain Licochalcone A, Glycyrrhetinic Acid and Hyaluronic Acid. Both products help to prevent photoageing and reduce the appearance of wrinkles.

If you already have sun spots, active ingredients such as B-Resorcinol, a key ingredient in the Eucerin Anti-Pigment range, can be effective at fading them. 


2. Source: Chartité report, Protective efficacy of licochalcone A containing sunscreen in the high energy visible spectral range in vivo, March 2016.

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