Your body has a master clock in your brain.
Inside your brain, in an area called the suprachiasmatic nucleus (SCN), sits a biological clock that controls almost every function in your body — sleep and waking, cortisol and melatonin, body temperature, immune function, and mood. This clock runs on a roughly 24-hour cycle, but it needs a daily reset signal to stay synchronised. Without it, the clock drifts. And when the clock drifts, everything suffers.
Light is the reset signal — but not all light works.
Your eye contains a special receptor called melanopsin that is completely separate from the rods and cones you use for vision. Melanopsin does only one thing: it detects light and sends a signal directly to your master clock. It has a peak sensitivity at precisely 480nm — a specific shade of sky blue.
Standard LED lighting uses a 450nm blue pump chip covered in yellow phosphor. The result barely touches the 480nm melanopsin signal your clock actually needs. Your lights look bright. Biologically, they are doing very little.
LightHealth products use a dedicated 480nm channel delivering the clinically validated minimum dose — restoring the signal that most indoor lighting fails to provide.
Timing matters as much as wavelength.
Getting the right wavelength is only half the answer. Your clock also needs to receive that signal at the right time of day. The wrong light at the wrong time can actively disrupt your circadian rhythm — which is exactly what standard home lighting does every evening.
Morning (06:00–09:00)
Your clock needs 480nm blue-rich light to fire the cortisol awakening response and suppress residual melatonin. The most biologically critical window of the day. LightHealth delivers blue-rich, high melanopic EDI — clock reset.
Daytime (09:00–18:00)
Balanced full-spectrum light for sustained alertness and wellbeing. LightHealth delivers full spectrum, balanced and comfortable across all eight spectral channels.
Evening (18:00–19:00+)
Melatonin production begins around 19:00. Any blue-rich light after this point delays sleep onset. Standard home lighting suppresses melatonin completely. LightHealth switches to a progressive warm transition — blue eliminated from 19:00.
Night
Zero blue. Zero white. The only safe night-time light is dim red-orange, which does not activate melanopsin and does not disrupt melatonin production. LightHealth delivers red-dominant only.
Frequently asked questions
How is LightHealth different from existing SAD lamps?
Standard SAD lamps deliver 10,000 lux of broadband white light — a blunt approach that works partly by chance, because broad white light contains some 480nm. LightHealth targets 480nm directly, delivering the clinically active dose at a fraction of the energy and without the visual discomfort of a 10,000 lux white lamp.
How long does it take to feel a difference?
Most people notice improved mood and easier waking within one to two weeks of consistent morning use. Clinical evidence shows measurable changes in cortisol and melatonin timing within seven days. Sleep quality improvements typically follow within two to three weeks.
Is LightHealth a medical device?
LightHealth products are wellness products, not medical devices. They are designed to support your natural circadian biology. They are not intended to diagnose, treat, or cure any medical condition. If you have a diagnosed condition such as clinical SAD or a sleep disorder, please speak with your GP.
How do I use it?
LightHealth products work automatically. Set your wake time once, and the device delivers the right spectrum at the right intensity at the right point in your day. There are no protocols to follow and no apps required.
Who is this for?
Anyone who spends significant time indoors — which is almost everyone. People with SAD or winter blues, poor sleepers, shift workers, frequent travellers, and anyone who consistently feels their energy and mood are not where they should be.