LED therapy used to mean a dermatologist appointment, a $200 charge, and forty-five minutes under a panel that smelled faintly of plastic. Now it lives on a shelf in your bathroom. The technology didn’t change much. What changed is the price and the form factor.
The science is unglamorous. Light at specific wavelengths is absorbed by specific cells in your skin. Different wavelengths reach different depths. The cells respond by doing what they were always going to do (produce collagen, calm inflammation, clear bacteria) just a bit more efficiently.
Red light · 633nm
Reaches the dermis (about 2mm down). Stimulates fibroblasts, the cells that produce collagen and elastin. Over weeks, this shows up as skin that bounces back faster, fine lines that soften, an evenness you didn’t have at 5pm.
This is the wavelength people mean when they say “anti-aging.” It’s the workhorse.
Blue light · 415nm
Stays shallow. Targets Cutibacterium acnes, the bacteria that turn a clogged pore into an inflamed spot. It doesn’t dissolve a breakout overnight, but used consistently, it reduces the bacterial load that causes new ones.
If your skin runs clear, you can skip blue. If you break out around your jawline once a month, you’ll feel the difference inside three weeks.
Near-infrared · 850nm
Goes deeper than the others, past the dermis, into the subcutaneous layer. Improves circulation, accelerates wound healing, calms post-procedure redness.
It’s the quietest wavelength. You won’t see immediate results. You’ll notice that things that used to take a week to fade now take three days.
Why ten minutes
The cells you’re trying to activate respond on a curve. Light exposure under ~5 minutes is below the threshold for measurable response. Past ~15 minutes the curve plateaus. More light isn’t doing more work, and it can actually trigger an inverse response (photo-fatigue).
Ten minutes is the sweet spot. Three times a week is enough for the cells to maintain the response between sessions. Daily doesn’t do more. It gives your skin no rest.
What it can’t do
LED therapy is slow and consistent. It won’t:
- Clear a cystic breakout overnight
- Replace SPF (it doesn’t darken pigmentation but it also doesn’t protect from UV)
- Tighten skin that’s lost significant elasticity (that’s RF, not LED)
- Fade post-inflammatory hyperpigmentation in a week (that’s actives, not light)
It will, on the order of months: even tone, soften lines, calm redness, reduce breakouts. It does this quietly. You notice when other people start noticing.
The protocol
- Cleanse. Skin should be bare, no actives, no SPF, no serum.
- Use the mask. Ten minutes. Eyes closed (the goggles help but ten minutes is long).
- Apply your evening serum after, not before. The skin is receptive. What you put on next gets in further than usual.
- Three nights a week. Tuesday, Thursday, Sunday is what most people land on.
That’s it. The ritual is short. The results are slow.
Worth it.