There are many uses for lighting. Minimally it provides safety by lighting pathways and stairs. Function is important. Beauty is important, too. Appropriate lighting transforms the landscape after dark. The landscape becomes nocturnal. Uplighting and downlighting get desired affects. Uplight a tree or garden art. Downlight a boulder or a table. The possibilities are endless.
You can even have fun turning lights off and on from your smart phone. Again, the possibilities are endless.