CCL: Tddft and tdhf accuracy

 Sent to CCL by: "Eli  Lam" [elizabeth.shlam-*-gmail.com]
 Dear all,
 I've learnt that tddft and tdhf both are methods for calculating excited states
 and electronic
 transitions.  I would like to ask which method is more accurate and give a
 "better" picture to an
 organometallic molecule's excited state, for example?
 I have learnt that tddft is not good for high excited states calculations but
 generally good for
 radicals.  But would it be good for neutral molecules too?  And in particular, I
 found tddft seems
 to have underestimated much for very conjugated systems. A friend said it's
 because tddft is
 based on ground state, and for excited states, hf does a better job.  I would
 like to ask for more
 views on that.  And would you please suggest some readings concerning the issue?
 Thanks so
 much!
 Regards,
 Eli