Over the last week I could swear I've seen way more 
types suddenly throwing around the word troglodyte left right and centre
Cave dwellings throughout history have generally had pretty good natural lighting, incidentally, since ancient humans had an even greater need for natural light than modern humans do. Your below street row house having poor enough natural lighting to basically drive a man to depression I'm willing to guess is a lot more to do with cost-cutting on the housing market than anything, honestly.