Every light resource should produce ambient light that poorly illuminates the environment (Because the light is reflected by material and so). Dayz has no such thing, flashligh only illuminates defined spotlight and surrounding environment is just like there is no light resource nearby.
That is bad, unrealistic and really hard for players inside buildings to play.
Anyway, it's not an issue, just strong recommendation and feedback from players side. With lights how they work at this moment, I am not going to play on any night server.