Sleep Lab · Research foundation
Your body uses light to tell time.
After dark, timing, intensity, duration, and spectrum all matter.
Light Is More Than Color
Two warm-looking lights can have different spectra.
Appearance is how light looks. Spectrum is what the light contains.
Spectrum After Dark
Nighttime light is an environment, not just a color.
Different wavelengths and exposure conditions can send different timing cues after dark.
Selected sources
Conceptual illustrations
Two ways to read nighttime light.
These diagrams summarize general research concepts. They are not Lume measurements and do not show a product-specific spectrum.
01
Spectrum is composition.
02
Evening light can change the nighttime signal.
Research context: Gooley et al., 2011 and Cain et al., 2020.