Science of light & skin
How different wavelengths of light influence skin structure, cellular health, and long-term skin ageing.
Understanding the relationship between light and skin to help support resilient, healthy-looking skin every day.
Understanding light
A life in light
Light sustains life and powers many biological processes. Yet sunlight is composed of different wavelengths, each interacting with the skin in distinct ways.
UVB acts at the surface, causing sunburn and direct DNA damage.
UVA penetrates deeper, driving oxidative stress and collagen breakdown linked to photoageing.
Visible Light contributes to oxidative stress and pigmentation changes, especially in deeper skin tones.
Infrared delivers heat deeper into the skin, increasing cellular stress and accelerating fatigue.
Beyond light, pollution acts as an additional stressor, amplifying oxidative damage and accelerating visible skin ageing.
UV & the skin
The short and long term effects of sun exposure
Short term effects of light exposure
Short term effects primarily occur in the outer layers of the skin, often following UVB exposure.
- Redness and sensitivity
- Temporary darkening of the skin (tanning response)
- Dehydrated or tight skin feeling
- Dull or uneven complexion
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Long term effects of repeated exposure
Over time, repeated light exposure contributes to deeper biological changes within the skin.
- Poor cellular energy and recovery
- Gradual collagen degradation
- Uneven pigmentation and dark spots
- Fine lines and wrinkles
- Loss of firmness and elasticity
- Rougher skin texture
- Cutaneous vascular abnormalities
Short term effects of light exposure
Short term effects primarily occur in the outer layers of the skin, often following UVB exposure.
- Redness and sensitivity
- Temporary darkening of the skin (tanning response)
- Dehydrated or tight skin feeling
- Dull or uneven complexion
(scroll or click to see more)
Long term effects of repeated exposure
Over time, repeated light exposure contributes to deeper biological changes within the skin.
- Poor cellular energy and recovery
- Gradual collagen degradation
- Uneven pigmentation and dark spots
- Fine lines and wrinkles
- Loss of firmness and elasticity
- Rougher skin texture
- Cutaneous vascular abnormalities
Cellular level
How light exposure influences skin cells
Keratinocytes
Located in the outer layer of the skin, keratinocytes form the protective barrier. Light-induced oxidative stress can weaken this barrier, contributing to dryness, sensitivity, and reduced resilience.
Melanocytes
Located at the base of the epidermis, melanocytes regulate pigment production. Environmental stress can make them overactive (dark spots) or trigger senescence, where they produce less melanin. This dual imbalance leads to uneven skin tone, with both dark spots and lighter patches.
Fibroblasts
Found deeper in the dermis, fibroblasts are responsible for producing collagen and elastin. Environmental stress impairs their activity, leading to a loss of firmness. They also release factors that act on melanocytes, directly contributing to pigmentation disorders.
Mitochondria
The guardian of skin longevity
Light doesn’t just affect the surface. It disrupts the skin’s energy centers: mitochondria.
As the cell’s “powerhouse,” mitochondria are the guardians of longevity, not only for skin but for all organs. They generate the vital energy required for skin to function, repair, and renew itself.
Environmental stressors such as UV radiation and pollution can impair mitochondrial activity. Over time, this imbalance may increase oxidative stress and affect the skin’s ability to maintain resilience. The energy provided by mitochondria is essential for the proper synthesis of collagen.
Supporting mitochondrial health is therefore a fundamental aspect of maintaining long-term skin vitality.
