From what I've seen, lights like my Fitzgerald SLP 115/HF seem to start the lamp almost instantly, without much pre-heat at all. On the instruction manual, it said about "warm start" ballasts for PIRs, which I presume give a longer preheat. Certainly the Fitzys at school on PIRs give a reasonably long preheat.
In many classrooms, there are conventional SS battens with electronic starters which seem to give at least twice the preheat of the warm starts.
Surely this means that HF reduces lamp life, not increases it?