I am thinking that most lighting, outside of the greenhouses, manufacturing, and some public areas, could be low level light similar in intensity to a full moon. This would save energy, and be similar to the ambient surface light of Mars. People are able to function well at this light level (from personal experience working third shift jobs), though vision is restricted to shades of grey. An issue would be the transition from high-intensity light to low light, which can take five to ten minutes.--Nate 02:27, 13 January 2009 (UTC)
On the other hand there are studies showing that proper eye development requires higher lighting. So at least some public areas need very high lighting and kids should visit these often.