"Allow Static Lighting" for unlit scenes?

Hi

Should this option be on ON on OFF for the fully unlit scenes?

It does say in the description something about static lighting overhead, so the first guess would be ‘off’. With my simple scene I can not see any difference in FPS, the Adreno 305 can run the game at 60FPS regardless of the setting. But will it have any impact on slower devices and will it be in favour of turnig it ‘off’ or ‘on’ for unlit environments?