i would also have to argue that tamjam. i would say for the average noob grower you are likely to get just as good of a yield, though admittedly a Pro-Grower can definitely do more.
ive seen a good grower pull out significantly more than most people can from Fluoros, though keep in mind this is T5HO, not just a few cfls or anything.
not wanting to argue, only saying that its all in the hands of the grower, to an extent. a professional who is very well schooled in MJ Botony could definitely do more with HPS... but that same farmer could also make some Fluoro harvests look better than many people could do with a HPS. Tam is right, if all you wanted was the shorter answer lol.
oh and MCL, and GL with your grow