NOT photobiomodulation and NOT gamma sensory stimulation. The circadian-entrainment mechanism is well established; building-scale outcome data are weak — grade at the upper end of the tier.
Origin & lineage
Human-centric / circadian lighting systems.
Claimed mechanism
Melanopic (blue-weighted) light timed to entrain circadian rhythm via ipRGC signalling.
Plausibility
Plausible / established mechanism (circadian photoentrainment); building-scale outcomes weak.
Evidence — grade B/C
Not photobiomodulation and not gamma sensory stimulation. Mechanism well established (NASA; 2025 peer-reviewed); building-scale outcomes weak — grade at the upper end of the tier.
Market
Makers: BrainLit; Saga and others. Models: Circadian luminaires. Price: Building-scale.
Kernel — keep vs set aside
Keep — real substrate
A real, established circadian-photoentrainment mechanism.
Set aside — claim
Building-scale health outcomes are weak; not a photobiomodulation or gamma-stimulation claim.
Regulatory status by jurisdiction
Registration or clearance is a market-access fact, never proof of efficacy.