What is light therapy ?
- A type of phototherapy in which the subject’s eyes are exposed to light free of IR and UV.
- The light dosage is expressed in Lux (light unit per surface unit) over a given time
What is a Lux ?
The Lux is the unit of lighting per surface unit. A given surface receives one Lux when it is situated perpendicularly at a distance of 1 meter from a 1 candela light source.
Examples :
- A moonlit night: 0.5 Lux
- A well lit apartment : 200 to 400 Lux
- A cloudy sky outdoors : 25.000 Lux
- A sunny day outdoors: 50.000 to 100.000 Lux
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