670nm Red Light: Independent Lab Test Results

Why We Test Our Lights — And What the Results Show

Not All "Red" Lights Are the Same

Many lights marketed as "red" still emit significant amounts of blue and green wavelengths. These shorter wavelengths are known to suppress melatonin and disrupt your body's natural sleep signals — even at low brightness levels.

Our 670nm red light was independently tested to verify what it actually emits, not what it looks like to the eye.

Independent Lab Test Results

Testing was conducted using EVERFINE LED spectrometry equipment, a standard tool used in professional lighting analysis.

Key Findings:

Measurement	Result
Peak Wavelength	670.3nm
Bandwidth	20.5nm
Red Output	98.4%
Green Output	1.5%
Blue Output	0.1%

What this means: The light output is tightly focused in the deep red range, with negligible blue and green emission — the wavelengths most responsible for circadian disruption.

Why 670nm Matters at Night

Your body uses light as its primary signal for regulating sleep and wakefulness. As daylight fades, your brain prepares for rest by releasing melatonin.

Blue, green, and white light:

• Mimics daytime light

• Signals "stay awake" to the brain

• Suppresses melatonin production

• Delays sleep onset, even at low brightness

Deep red light (670nm):

• Long wavelength, low visual stimulation

• Minimal impact on melatonin

• Allows the brain to transition into sleep mode

• Provides visibility without alerting the nervous system

  
  

What the Test Confirms

• ✓ True 670nm peak wavelength (not a broad "red-ish" spectrum)

• ✓ 98.4% of light output in the red range

• ✓ Blue light emission at negligible levels (0.1%)

• ✓ Spectrally narrow output (20.5nm bandwidth)

• ✓ Low visual brightness by design 

  
  

Why This Testing Matters

Most consumer lighting products don't publish spectrum data. Without independent measurement, there's no way to know whether a "red" light is actually blocking the wavelengths that interfere with sleep.

We publish our test results so you can verify the claims yourself.

View the Full Test Report

[LINK: Download the complete EVERFINE spectrum test report (PDF)]

Testing conducted by independent laboratory using EVERFINE spectrometry equipment. Results reflect the 670nm mode of Amber Light+ Pebble products.