More security through (literally) obscurity isn't exactly the best way to secure your network. Nobody will say "oh yeah, I'm sure nobody can see our Li-Fi light

More security through (literally) obscurity isn't exactly the best way to secure your network. Nobody will say "oh yeah, I'm sure nobody can see our Li-Fi lightbulbs so we won't put any encryption on the damn thing."--physical security is only a complement to software security. Wi-Fi can and is plenty secure if you do it right.