Humans (even programmers :-) ) are used to having some access to natural light, but in a colony in space, on the dark side of a tidally-locked planet, or underground (for example) this won't happen. Are there known (documented) effects on people's health (physical and psychological) as a result of living in such an environment, where all light is artificial?
Assume the timing of lighting changes is under inhabitants' control, and that any lighting technologies currently known can be applied.
I'm not asking about temporary situations (like winter in Antarctica) but about living in such an environment for years.
I'm aware of Seasonal Affective Disorder (SAD) and that it can be mitigated by special lamps producing light in a particular range of the spectrum. What else could go wrong in this environment? Assume the use of dietary supplements to make up for the loss of Vitamin D through sunlight.
Because they will have access to light (just not sunlight) I'm assuming that their vision won't degrade (a la Wells's Morlocks), but if that's wrong, please correct me.