Lumina is a lightweight desktop environment, free of D-Bus and *kit, designed to have as few system dependencies and requirements as possible. Check this Wikipedia article, and the official handbook.
To install Lumina desktop, run:
pacman -S lumina lumina-extra
A configuration file is installed in /etc/luminaDesktop.conf . Lumina also has a bunch of own configuration tools.
Lumina provides its own replacement for startx to be started from console.
start-lumina-desktop
Alternatively it can be added to the ~./xinitrc file for being started via startx or a display manager
Make sure to read this article, for more information on managing startx on Arch GNU/Linux (the information applies to Hyperbola, as well). But relevant commands are bellow:
[[ -f ~/.Xresources ]] && xrdb -merge -I$HOME ~/.Xresources exec start-lumina-desktop