Before, I'm using dark+red for my glossy 1520. I became curious if light background really drains a considerable amount of juice but I observed that it doesn't. I also turned my other apps into light theme as well.
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on phones with LCD displays (lower end Lumias, the 920, 1520), white or black doesn't affect power usage.
It does on phones with the AMOLED screen tech onboard like the 930, 820, 925...
But if that's the case, why does Nokia still include that notice on their LCD phones? I understand its disadvantage on AMOLED phones.