Is it possible that your neighbor's honey was
extracted from former brood comb?  That can
substantially darken the honey...

I did see a new local brand of  honey on the store shelve this week.  It was
dark. Although I don't know the producer, he is not that far away.  I wonder
what his bees found that mine couldn't, that is if it is his honey and he is
not buying it in from who knows where.