Maybe I should have emphasised the word "artificial" rather than the word "blue", the implication was that it's not the only type of blue light, the sun being t

Maybe I should have emphasised the word "artificial" rather than the word "blue", the implication was that it's not the only type of blue light, the sun being the obvious one. The thing about the sun is, you get no light when there's no sun, and some countries don't even get daylight for several months of the year!