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Every claim is a measurement, not a marketing line. Here is the science the lenses are built on, and the data that ships in your box.
Your circadian rhythm is set by light hitting your eyes, not by the hour on the wall. Specialised receptors in the retina read the blue end of the spectrum and tell the brain whether it is day or night. A bright screen at 11pm reads as noon.
Melatonin suppression is driven by the 380 to 520nm band, the blue to blue-green part of visible light. Block that band in the hours before bed and the suppression stops. Everything else about a lens is secondary to how much of this band it actually removes.
A clear lens transmits almost the entire 380 to 520nm band, blocking somewhere around 5%. The blocking power lives in the colour, and the deeper the colour, the more it stops. A lens that looks clear is, by definition, letting the light through.
Every batch is run through an independent spectrometer and the measured transmission curve is printed and shipped in your box. The Night lens blocks up to 98.5% of the band, with batch-to-batch variance held to within 0.4%. The number on this page is the number on your report.
Daytime calls for colour accuracy and a cut on the worst of the blue peak, so the Day lens reads near true-to-color. The last hours before bed call for maximum protection, so the Night lens goes deep orange. No single lens does both jobs well, which is why the pair ships with one for each.
