Frequently asked questions


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Delivery takes up to 7 working days.

  • Spectral range of the LYS Button:
    LYS is an RGB sensor with a spectral range from 350-750nm.
  • Intensity range of the devices have in lux:
    0-100.000 Lux.
  • Units of measurement and definition metrics:
    Kelvin: Colour temperature measured in Kelvin
    RGB: Counts/μW/cm^2
    Lux: Light intensity measured in Lux
    Movement (3-axis accelerometer): Proxy for activity. Count the number of times acceleration exceeds 0.1875g (g=gravitational force) in any of the 3 axis over the logging time interval
    mLux: melanopic lux, α-opic equivalent daylight (D65) illuminance with spectral age correction

The LYS Button has 18 hours of internal memory, which means that the LYS Button can be worn during a whole day without having to carry the phone. Once a day the phone should be next to the Button in order to enable data transfer.

Yes the LYS Button tracks light while charging. We recommend charging it during the night and to place to charging dock on the bedside table in order to track light while asleep.

LYS takes your privacy and security seriously. We are fully compliant with GDPR and do not sell or share personal data with third-parties. Read our privacy policy to find out how LYS processes data and for what purpose.