First: are they dark circles, or a shadow?
Most people use "dark circles" to describe any darkness under the eyes. But under-eye darkness comes from a few distinct sources, and they do not all respond to the same approach. Knowing which one you have saves money and sets the right expectation.
Caused by more melanin concentrated in the under-eye skin. It looks like a brown tint rather than a shadow. This is the type most associated with a more even appearance after consistent surface-level care.
The skin under the eyes is thin, so what sits beneath it can show through and read as darkness. This type fluctuates — worse on low-sleep mornings, better when rested. Its appearance is the most responsive to a consistent rested-skin ritual.
This is not discoloration at all — it is a shadow cast by the natural hollow beneath the eye (the tear trough). Because it is an absence of volume rather than a pigment, no light-based device changes it. This type is addressed only by volume-based clinical options, if at all.
A 5-second self-check: in good light, gently lift the skin at the top of your cheekbone with one finger. If the darkness mostly disappears, it is largely a structural shadow — a device won't change it. If the tone stays, it is pigment- or vascular-related, and the appearance may respond to a consistent ritual.
What does red light therapy do for the under-eye area?
Red light at 630nm is absorbed by the outer layers of skin. Applied consistently to the eye area, it is associated with skin that looks more even in tone and more refreshed over time. The effect is on appearance, and it is cumulative — visible over weeks of daily use, not after a single session.
What it is not: a treatment, a bleaching agent, or a way to remove pigment. It does not "erase" dark circles. It supports the appearance of a more rested, more even under-eye area as part of an ongoing maintenance ritual — which, for pigment- and vascular-type darkness, is often what people are actually after.
What red light won't do — said plainly
If your under-eye darkness is a structural shadow from a hollow, no at-home light device will change it, and any product that claims otherwise is overpromising. The same is true for deeply set pigmentation, which may need a dermatologist's input. Being honest about this is the difference between a tool you keep using and one that disappoints you into a drawer.
For the two types that do respond — pigment and vascular — the realistic outcome is an under-eye area that reads as more even and more rested, maintained through consistent use. Not transformed. Maintained.
The Halo is not a medical device and is not intended to diagnose, treat, cure, or prevent any condition.
How to use red light therapy for under-eye darkness
The approach that produces a visible difference is consistency, not intensity. A short daily session beats an occasional long one.
- Cleanse and apply your eye product first Start with clean skin and whatever serum or moisturizer you already use. Pat gently with the ring finger — no pulling on this thin area.
- Apply red light for 10 minutes, daily Consistency is the active ingredient. A hands-free device worn during your morning removes the decision of when to use it, which is what makes daily use realistic.
- Give it several weeks before judging The appearance shifts cumulatively. A single session shows nothing; daily use over weeks is where the more even, rested look appears.
- Protect the area through the day Daily SPF on the under-eye area matters most for pigment-type darkness, where sun exposure deepens the tone over time.
What else supports the appearance of a more even under-eye
- Consistent sleep — the single biggest factor for vascular-type darkness that fluctuates day to day.
- Daily SPF on the eye area — the most effective long-term habit for pigment-type darkness.
- Steady hydration through the day, which supports how rested the whole eye area looks.
- Gentle handling — no rubbing or pulling, which stresses thin skin and can deepen tone over time.