The science of sleep

Hidden in our eyes are incredibly sensitive receptors dedicated to detecting blue and green light. While most sensors in the eye send images to the brain so we can see, these sensors connect directly to your internal body clock, telling your system whether it is day or night.

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Blue and green light

Even small amounts of blue and green light — especially wavelengths between 420–540 nm — can interfere with your brain's natural production of melatonin. Melatonin, often called the 'sleep hormone', signals to your body that night has begun, helping you fall asleep and maintain a healthy circadian rhythm.

Even looking at your phone for 15-seconds can trigger a biological 'reset', delaying your circadian rhythm by an average of around 35 minutes.

Blue and green light

The problem with LEDs

Most LEDs — including many “warm white” lights — actually start as blue LEDs coated with a phosphor layer to change their colour. This is how the vast majority of lamps and night-lights are made. As a result, many lights that appear yellow or amber still contain significant amounts of blue light.

The graph below compares the typical spectrum of common lighting with the narrow-band scientific LEDs used in Amber.

The problem with LEDs

How common lights compare to Ambers circadian-safe spectrum

Comparison chart

What the research shows:

"Exposure to room light in the 2–3 h before bedtime is associated with a later sleep onset and shorter sleep duration... and can cause a reduction in the secretion of the sleep-promoting hormone melatonin."

— Endocrine Society, Clinical Practice Guidelines (Circadian Rhythm/Melatonin Policy)

"Amber light LEDs resulted in significantly less inhibition of melatonin compared to blue-green wavelengths, which caused the most significant circadian delay."

— Adapted from Wang et al., 2024 / Brainard et al., 2001

"Even bright amber light has been shown to have no significant suppressive effect on melatonin, while white or blue light can reduce it by more than 50% in the same timeframe."

— Adapted from sleep hygiene reviews (2025/2026)

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