[ReactiveJelly]

It might enable security but I wouldn't say it _ensures_ it.

It just means that visible or IR light (What are they using?) won't leak through walls the way Wi-Fi does. Depending on how wide the beam is and exactly how it all works, it _might_ still leak out of windows and under doors. But it's not like someone casually wardriving outside your house will get as much as they would from Wi-Fi, I would think.

[Turing_Machine]

Yeah, you'd want blackout curtains (or better, paint) on your windows. Still cheaper and easier than making your office into a Faraday cage.

[jfoutz]

Working graveyard and renting, I learned aluminum foil is perfect. cheap, trivial to install and remove. and perfectly opaque.

[swayvil]

What did you use to attach the foil?

[jfoutz]

my windows had little bits of molding and surfaces for the foil to crumple up against and conform to. I didn't need anything else. I suppose tape would work.

[bb88]

That assumes that Li-Fi doesn't leak RF still.

[osigurdson]

Can encryption not be used with LiFi?

[smallnix]

How can visible light pass from a core of a star or planet to the outside, but some routers light not? I guess it's just super duper faint?

[colechristensen]

Visible light does not pass from the core of a star to the outside.

The sun has a radius of about 700,000 km. Only a few hundred km is transparent enough for light to pass through and has a density of about 300 mg per cubic meter. Roughly the density of air at the altitude where airliners cruise.

The photons you see originate from a layer that’s just 0.5% of the radius of the sun. That layer is heated with other photons from inside. The core temp is 15 million K while the photosphere is around 5800 K. The spectrum of the core were the rest of the sun transparent would be much different and … unsafe. (Not that this really makes sense, if the rest of the star was transparent it would go nova)

[Modified3019]

Using light to heat up the walls of a home enough to start emitting significant black body radiation poses some additional engineering challenges.

[wiml]

The house's thermal mass would also limit the data rate.

[tsimionescu]

I think that yes, compared to the core of a star, a LiFi AP is aptly described as "super duper faint".