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Originally Posted by SteamWake
Even with what is known as CRI or color rendering index great advances have been made through the use of exotic metals  in the suspended gas to get closer to 'white light'. |
Perfectly white light is exactly what most people DO NOT want in their living places! The...
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red 'warm' end of the spectrum.
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...that...
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give your skin that 'glow'
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... is what most people prefer to have in the light for their living areas! That it reminds of the setting sun corresponds with the changing physiological conditions of your body at the end of the day when the organism is coming to rest and prepares to sleep, it also gives us psychological satisfaction to have a light that compares a bit to the light of fire. that'S why candle light for most people has a very intimate, emotional meaning that perfectly white light simply does not acchieve.
I want to just hint at mecial research showing that the human physiology and the hormone homeostasis even reacts to/is effected by light even with the eyes being shielded and not percieving the light. Correspondingly, lack of light and lack of certain light waves/frequencies have physiologixal consequences too. It can make us serious ill, it can affect both our physis or our psyche - or both.
Some people claim to get headaches from energy saving bulbs, and it is believable that people are sensible in varying degrees here. I for example get burning eyes if needing to stay in rooms with classic flourescent tubes' light for longer time. I know that medical examinations have shown light quality to influence the physiological arousement level of people, and as an (ex-)psychologist I am not surprised that light plays a role in how easily or difficult people can come to sleep. In the medical field, we are talking about individual threshholds here, and that means some people may be sensitive to a variable, while others are not. Treshholds even change for every individual eventuelly, over the course of the day.