Quick answer: Visible red light (around 630–660 nm) is absorbed near the surface and is best for skin. Near-infrared (810–850 nm) is invisible and penetrates deeper, targeting muscle, joints and deeper tissue. Many quality devices emit both, so you cover surface and depth in one session.
Red light: surface and skin
Red wavelengths don’t travel far into tissue, which makes them ideal for skin concerns — collagen, tone, and fine lines.
Near-infrared: deeper tissue
Near-infrared penetrates further, which is why it’s the wavelength studied for muscle recovery, joints and deeper aches. You can’t see it, so devices often add a dim red indicator.
Which do you need?
Skin only? Red is enough. Recovery and deeper tissue? Look for a device that includes near-infrared, or both. General wellness information, not medical advice.
Related answers
Shopping for a device? See our red light therapy picks, or start with the complete red light therapy guide. General wellness information, not medical advice.
FAQ
Is infrared or red light better?
Red is better for skin (surface); near-infrared penetrates deeper for muscle and joints. Many devices use both.
Can you see near-infrared light?
No — near-infrared is invisible, so devices often add a faint red indicator light.