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How to measure light?

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linux-howto

http://unix.stackexchange.com – I've got notebook Dell Latitude E6410 which changes lcd light intensity based on intensity of surrounded light, so it has to have some photocell. What software or how can i use it to view data from this photocell? I tried different google searches like lux meter, light intensity monitor and so one and did not find single right thing. (HowTos)