Once I put my torch into my hand, press selected key to hold out torch then put torch away into (any) backpack, the light still shines up and also I noticed the torch shines though buildings, lighting up areas around.
Most apparent in barracks when I put torch away, walked out and the light was shining up into the sky though the building, even tho my torch was put away.
This is a duplicate report and/or the developers are already aware of this bug/problem.
Please check the feedback tracker to see if an issue exists before creating a new one and instead vote the original one up so the developers can see it's a common problem. (Most of the most popular will be up top if ordered by Priority).
You can also use the 'Filter' textbox to search through existing reports using a keyword if it's not close to the top.
A list of important bug/issues that the developers are already aware of can also be found on the DayZ Forums:
http://forums.dayzgame.com/index.php?/topic/153994-early-access-important-information-known-issues/
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Cheers