You are so correct about the almost greenish tinge of the mercury vapour lights and how long they took to get up to full brightness. It was so weird to come into Calgary from the south at night when the conversion from mercury to sodium happened, one was so used to the white lights that the amber one's looked odd and dim. It'll be interesting to see how much more of the stars we can see at night from our backyard now that our community and neighbouring communities have been converted to LED's - we could see quite a bit before and even aurora borealis.
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Just a wee bit below average prairie boy in Canada's third largest city and fourth largest CMA
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