I'm beginning to get curious about the battery life implications of user interface choices. Do the number and identity of displayed complication affect it? Does the choice of a face? Take the Infograph face, for ex.: does it consume more power when the face is white than when it's black? Does it consume more power when fully loaded with complications than it does when displaying none at all?
In the same way, I wonder about the power consumption of Dark Mode in Mojave (for users of laptops, of course). Does white text displayed on a black background consume significantly less power?