The values are logarithmic. In Philips words:
Light level in 10000 log10 (lux) +1 measured by sensor. Logarithm scale used because the human eye adjusts to light levels and small changes at low lux levels are more noticeable than at high lux levels.
So equivalent values:
Example Lux MeasuredValue
Overcast moonless night sky 0.0001 0
Outdoor: Bright moonlight 1 1
Home: Night light 2 3000
Home: Dimmed light 10 10000
Home: ‘Cosy’ living room 50 17000
Home: ‘Normal’ non-task light 150 22000
Home: Working / reading 350 25500
Home: Inside daylight 700 28500
Home: Maximum to avoid glare 2000 33000
Outdoor: Clear daylight > 10000 > 40000
Outdoor: direct sunlight 120000 51000