Dual Color 660nm 850nm 2835 SMD LED Chip

Why 660 nm and 850 nm are preferred wavelengths for red therapy and medical beauty lights?

1️⃣ Skin Penetration Depth

660 nm (Red Light) - penetrates about 2–3 mm into the skin, reaching epidermis and dermis layers.
👉 Ideal for surface-level treatments such as:

Skin rejuvenation

Collagen production

Wound healing

Acne and scar reduction

850 nm (Near-Infrared Light) - penetrates much deeper, around 15–25 mm, reaching muscles, joints, and deeper tissues.
👉 Used for deep-tissue and pain-relief therapy, including:

Muscle recovery

Joint inflammation reduction

Improving blood circulation

Enhancing cellular energy (ATP production)

2️⃣ Mitochondrial Absorption

Both 660 nm and 850 nm wavelengths match the absorption peaks of cytochrome c oxidase (CCO) - a key enzyme in the mitochondria.

When these wavelengths are absorbed, they help mitochondria produce more ATP (cell energy).
👉 More ATP = faster cell repair, regeneration, and metabolism.

3️⃣ Safety and Efficiency

These wavelengths are within the optical window of biological tissue (600–900 nm) - meaning minimal scattering and absorption by water or melanin.

That's why light in this range can penetrate efficiently without overheating the skin.

4️⃣ Proven Clinical Evidence

660 nm + 850 nm combinations are the most clinically tested and proven wavelengths for PBM therapy.

Many FDA-cleared and CE-certified red light therapy devices use this dual combination for maximum therapeutic effect.

✅ Summary