what is "nits" (brightness)? how to calculate?

[nooktablet]

i think my battery drains too fast but i'm not really sure, i want to test my battery life so i checked how asus tested battery life

Battery life tested under power saving mode, playing 720p video playback, Brightness:60nits, default volume with headphones.

(They claim the battery 10 hours without dock)
but i'm not sure what does "60 nits" mean? i heard the tf300 "has" 350 nits, so 60/350= around 17%. but if you set your brightness to 17% you can't really see anything. so i get confused.

and it's funny that's they tested the battery under power saving mode, "default volume" with headphones, i mean it sounds like they want to save the battery power as much as possible and to give us the number 10 hours. what if they tested in balanced mode (which is the default mode) with speaker not headphones? and again, i don't know how many % are 60 nits?

 

[mcall_r]

I agree, I find that mine only lasts about 5-6 hours, about 8-9 with the keyboard dock on.
I mainly use mine for web browsing with brightness about 25% and power option set to balanced.

Does browsing use more than playing 720p video then?

Either way, it always manages to last a day away from the home so I've never had it run flat.. can't really grumble I suppose.