When you start looking for a red light therapy device, you'll quickly come across two numbers: 660nm and 850nm. But what exactly do these wavelengths mean? And which one do you need?
What are wavelengths?
Light consists of waves. The wavelength determines the color of the light — and how deeply it penetrates your skin and tissue. In red light therapy, two wavelengths have been clinically proven effective:
- 660nm — visible red light
- 850nm — near-infrared light (invisible to the naked eye)
660nm: for your skin
660nm red light penetrates the upper layers of the skin (epidermis and dermis). It stimulates fibroblast cells responsible for the production of collagen and elastin — the building blocks of firm, youthful skin.
Ideal for:
- Reduction of fine lines and wrinkles
- Acne treatment and inflammation reduction
- Pigmentation spots and an even skin tone
- Wound healing and scar repair
- General skin rejuvenation and glow
850nm: for muscles, joints, and deeper tissue
850nm near-infrared light is invisible but penetrates much deeper — up to 5 centimeters below the skin. It reaches muscle tissue, joints, bones, and even the nervous system.
Ideal for:
- Muscle recovery after training
- Relief from joint pain and arthritis
- Reduction of chronic inflammation
- Hair growth (stimulates hair follicles in the scalp)
- Improvement of blood circulation
Which wavelength do you need?
The good news: most high-quality red light therapy devices combine both wavelengths. This way, you benefit from advantages at both skin and deeper tissue levels simultaneously.
- Only skincare? — 660nm is sufficient
- Muscle recovery or joint pain? — 850nm is essential
- The best of both worlds? — Choose a device with a 660nm + 850nm combination
What does science say?
Both wavelengths have been extensively researched. There are thousands of clinical studies confirming the effectiveness of 660nm and 850nm for skin rejuvenation, muscle recovery, pain relief, and more. The combination of both wavelengths yields the best results in most studies.
At Kenza Beauty Lab, we only select devices that work with the clinically proven wavelengths of 660nm and 850nm. View our complete range and find the device that suits your goals.
Discover our Red Light Therapy collection and choose the device that suits you.
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