Downward pendants bring light close to a key surface like a dining table or side table which helps create a sense of intimacy. Upward pendants and general-glow pendants give a more ambient light to the room’s core with the former letting light bounce downward off the ceiling first while highlighting any overhead features in the process.
It’s important to understand that even on a sunny summer day natural light from a single window is not always sufficient to thoroughly light a room and of course this is especially true come nighttime. Additional light sources near your window will allow you to subtly fill out the light scheme and achieve a balance so the space feels beautiful at any time.
Wall washers either installed on the wall or aimed down from the ceiling are used mostly to highlight decorative features such as an art piece or a textured finish like a brick wall. However the psychological effect created by lighting the walls can make the whole room feel much brighter.