Everyone seems to go for LEDs to simulate outdoor lighting for this kind of purpose, when there is another way that seems much more elegant to me: fiber-optic solar lighting.
Indeed more elegant, but also more pricey. The LED solution was $1000, which could still be affordable for a student living in a bunker. It's also easier to install, especially if you don't own the place and cannot run thick fiber bundles through the walls.
Yeah, it's something best planned with construction, and a bit pricey, but worth keeping in mind for anyone who intends to build a bunker. :)
Also not bad for high efficiency net zero type homes to supplement natural light without too many windows compromising the thermal envelope. I personally like the variability of natural light for how it keeps you connected to the outdoors. You know when a cloud is overhead or the sun is rising or setting. I've simulated sunset and sunrise with LEDs through color temp and timing but I've always wanted to experience the solar fiber type.
Presumably you also need a system to produce light indoors at night. You might as well have a single solution for both day- and night-time that uses renewable energy.
I bet the air filtration system runs on electricity, they probably have a backup generator that lasts X number of days. After that you won't have clean air so light won't be an issue either.
https://www.shieldenchannel.com/blogs/solar-panels/fiber-opt...