Absolute or porcentual lux readings in philio pst02-1a?


I have been trying a Philio 4 in 1 multisensor (a pst02-1a) and it works nicely. My doubt is about light reports. Theoretically it has a range of 0 to 500 Lux, but I only get measurements from 20 (ambient light) to 95 (torch pointed).

So I wonder if it reports percentage of maximum range instead of absolute lux readings. I haven’t found any configuration option to change this behaviour. Could someone confirm me this?