How it works
Light therapy is easy to oversell, so here is the mechanism in plain terms.
Different wavelengths reach different depths
Skin is layered. The epidermis sits on top, the dermis underneath it, and below that subcutaneous fat. The dermis is where collagen lives and where fibroblasts, the cells that produce it, do their work.
Longer wavelengths of light travel further into tissue than shorter ones. Blue at 470nm is absorbed close to the surface. Green at 520nm and yellow at 590nm reach a little further. Red at 630nm travels deepest of the four, into the upper dermis.
That is the reason a device offers more than one colour. Each is absorbed at a different depth.
A simplified drawing, not a scan or a measurement.
What the light is doing there
The prevailing explanation is that light in these ranges is absorbed by structures within the cell involved in energy production, and that this modestly influences cell activity. This is a well studied area, but it remains active research rather than settled fact, and any effects are gradual and modest.
Which setting to use
| Setting | Commonly used for | When |
|---|---|---|
| Red, 630nm | The appearance of fine lines and firmness | Your default, most nights |
| Yellow, 590nm | The look of redness and uneven tone | Weeks your skin looks flushed |
| Green, 520nm | The look of dark spots and dullness | Occasional |
| Blue, 470nm | Blemish prone skin | Breakout weeks, not nightly |
The research behind red is considerably stronger than the research behind yellow and green. If you only ever use red, you are using the mask correctly.
What this means for you
It means consistency matters more than session length, and it means honest expectations. This influences the appearance of skin over weeks, not days, and it does not work equally well for everyone.
Six Thirty is intended for home cosmetic use. It is not a treatment for any medical condition, and nothing here is a claim to treat, cure or prevent one.