Penetration depth: 0.5–2 mm · superficial

• Kills acne-causing bacteria through porphyrin photo-oxidation
• Supports melatonin and circadian rhythm modulation
• Reduces sebaceous (oil) gland output
• Use with caution — oxidative stress possible if overused

Penetration depth: 3–5 mm · dermis

• Surface photobiomodulation of skin and capillaries
• Stimulates collagen production in fibroblasts
• Accelerates wound and scar healing

Penetration depth: 5–10 mm · deep dermis

• Strong collagen induction — deeper than 630 nm
• Anti-inflammatory at the dermal layer
• Improves microcirculation and skin tone

Penetration depth: 15–30 mm · deep tissue

• Deep-tissue ATP boost — primary energy molecule of cells
• Muscle and joint repair at depth
• Neuroprotective PBM — brain and nerve support
• Reduces chronic inflammation

Penetration depth: 20–35 mm · deep tissue

• Mitochondrial activation with higher photon penetration than 810 nm
• Vascular repair and cell proliferation
• Strong hemoglobin absorption — improves oxygen delivery

Penetration depth: 25–40 mm · deepest NIR

• Deep PBM for muscles, joints, and brain
• Improves circulation and oxygen utilization
• Chronic pain reduction

Penetration depth: 10–20 mm · adipose tissue

• Thermal fat-cell apoptosis — body contouring
• Local circulation and lymph flow improvement
• Mild tissue tightening via heat-based mechanism
• Temperature controlled — must not exceed 45 °C