~ 450–495 nm
Blue sits at the shorter end of the visible spectrum — the colour of sky and sea, long associated with calm and clarity. It also has an image problem worth correcting: the concern around blue light relates specifically to artificial exposure at night, which can disrupt melatonin production and sleep. In daylight hours, blue light is not only safe — it is essential, regulating the circadian rhythm, supporting alertness, and playing a fundamental role in human biology.
In photobiomodulation, blue light is strongly absorbed by porphyrins found in certain bacteria, and interacts closely with the skin and lymphatic system. It is the frequency of clarity, drainage and calm — supporting the body's own efforts to clear what no longer serves it.
Primary characteristics
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Short wavelength
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High photon energy
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Strong interaction with surface tissues
Biological relevance
Blue light interacts with flavoproteins and porphyrins and has well-documented antimicrobial and biofilm-disrupting properties. It also plays a role in immune signalling and circadian regulation.
Because of its shallow penetration, blue light is particularly relevant for:
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Skin
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Surface inflammation
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Microbial stress at or near the surface
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Neurological signalling via retinal and cutaneous photoreceptors
In simple terms:
Blue light is precise, energetic, and surface-focused — like a scalpel rather than a hammer.
Benefits
Supports lymphatic drainage and immune function · Targets surface bacteria and pathogens · Calms nerve pain and superficial inflammation · Assists wound healing and skin repair · Regulates circadian rhythm · Promotes nervous system balance
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