Last updated: 13 August 2026
660nm is visible red light. 850nm is near-infrared, invisible to the eye. The difference is how far each travels into tissue: 660nm acts at the surface, 850nm goes deeper. Devices listing both are covering both depths in one session. That is a statement about physics, not about outcomes.
What the numbers mean
| Wavelength | Visible? | Reaches | Typically used for |
|---|---|---|---|
| 660nm | Yes — deep red | Skin surface and just below | Face and scalp devices |
| 850nm | No — near-infrared | Deeper than visible red | Panels, body wraps and belts |
Because 850nm is invisible, a device emitting it can look dim or even off while running. That is expected and is not a fault.
What we will not tell you
We are not going to claim these devices treat, cure or prevent anything. They are personal-care wellness devices, not medical devices, and they are not intended to diagnose, treat, cure or prevent any condition. We make no claims about skin, hair, pain or recovery outcomes.
That is a deliberate position, not a legal hedge. Red light therapy is a category where sellers routinely overclaim, and the honest version of the pitch is narrower: here is the wavelength, here is the wattage, here is the session length, here is a 90-day guarantee counted from delivery so you can decide for yourself.
Power matters as much as wavelength
Two devices can both say "660nm + 850nm" and be very different products. What separates them is output and coverage area. Our desktop panel is a 45W array behind an aluminium frame — it covers the area in front of it, not a whole body. A wearable mask or cap covers a fixed area at a fixed distance, which is more consistent but smaller.
Be sceptical of any listing that gives a wavelength and no wattage.
How a session actually works
- Distance: 6–12 inches from a panel. A wearable sets its own distance, which is part of the appeal.
- Time: ten minutes is the standard session across our devices.
- Frequency: once a day. Consistency matters more than length for anything habit-based.
- Eyes: the LEDs are bright. Eyes closed for masks and caps; do not look directly into a panel.
Which format fits which use
- Panel ($224.99) — aim it at anything. The only format that stays useful when your target changes.
- Face mask ($129.99) — face only, hands-free, consistent distance.
- Waist belt ($129.99) — wraps a joint or the lower back, stays put while you move.
- Scalp cap ($249.99) — one job, done hands-free.
A fuller side-by-side is in our panel vs mask vs belt vs cap comparison.
Frequently asked questions
Is red light therapy safe?
These are low-power LED devices, not lasers, and they do not emit UV. The main practical caution is brightness — use them with your eyes closed. Consult your physician before use if you are photosensitive, take medication that increases light sensitivity, are pregnant, or use an implanted device.
Can I feel it working?
You feel mild warmth at close range and nothing else. There is no sensation that indicates it is or is not doing anything.
How long before anything changes?
We do not make that claim. Anyone giving you a specific timeline for a specific outcome is telling you something they cannot know about you.
Delivery and returns?
Delivery within the US takes 2–4 weeks, tracked. Free tracked shipping over $70. 90-day money-back guarantee counted from the day it arrives — long enough to actually form an opinion.