Lux: light, circadian rhythm, and screen time
Light is information your body uses to set its clock. Most indoor environments give it the wrong information.
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UV index: sunburn risk in a single number
The UV index condenses solar ultraviolet intensity into a 0–11+ scale. Above 6, take precautions. Above 8, every minute counts.
Circadian and ambient context
Time of day is a meaningful signal: many air-quality readings rise and fall with the sun and with the household's daily routine.
Lux and indoor-air context
Lux helps interpret placement, daylight, display behavior, and occupancy patterns. It is not proof of circadian lighting performance or WELL lighting compliance.
