Im testing out soem cave base designs on my own server (self running) and am just wondering if there is a simple plugin, command, or some other way (other than just using a lamp or something) to make it brighter to see in the cave.

https://umod.org/plugins/night-vision

o.grant group admin nightvision.allowed EDIT: Not even sure if this works in caves.

If you're just on your own locally hosted server:

bind o env.time 10 EDIT: Again, not sure about your cave-specific question, sorry.

CaveVision mod is needed, maybe. Spawn in some flares, or a headlamp and 1k fuel or EverLight.