What did John Stuart Mill mean by enlighted utilitarianism?

Answer 1

The phrase 'enlightened utilitarianism' is intended to
distinguish Mill's brand of utilitarianism from all other
forms of utilitarianism; chiefly from that of his
predecessor Jeremy Bentham. Mill's utilitarianism is
thus 'enlightened' because it is an altogether deeper
and more complex philosophy. So, 4X, the concept of
'happiness' is much richer and better than Bentham's.
And in the same way, Mill expands the concept of
'pleasure' to include both higher and lower forms of
pleasure. Examples of this 'higher pleasure' would
include things like love and friendship.

Answer 2

I'm going to guess that he was trying to put a more moral spin on J bent hems utilitarianism. ???