Can you change an iPhone startup screen background from white to black? It seems light-coloured iPhones have a white startup background colour with black Apple logo. As you can’t control the brightness on startup - this screen is offensively bright at night - searing your darkness-adjusted eyes and waking any nearby creature who happens to be peacefully sleeping. 

Can you invert it like on dark-coloured iPhones? Black background, white Apple logo?
Unless you jailbreak the phone, no...can't be done. 

The startup screen even ignores the accessibility settings.