[ygjb-dupe]

I think you underestimate the importance and cost of the artificial lighting :P

On the moon it means you need enough solar power in batteries to power your gear, and to power appropriate spectrum lighting for plant growth.

If you can rely on solar power more reliably, then you can construct (significantly more complex than those required on earth) green houses which still benefit from natural light.

[aetherson]

In all fairness, my parent poster was talking about human circadian rhythms, not greenhouses.

I actually agree that there are numerous challenges associated with very long days and nights. Artificial lighting per se is not among them. Solar power is a reasonable one.