Cheers for that info. I was under the impression the Ironlights were a bit lighter than that, so maybe they're not for me. I was looking at the options for shaving a bit of weight from the current setup, though I'm fairly happy with it so it's not too big a deal:
Dura-Ace FC-7410 175mm cranks (444g/pr)
53t outer ring (92g). (My 52t ring would save 16g too)
39t inner ring (35g)
7075 bolts (9g)
= 580g total for the chainset, plus BB bolts. BB is a UN72, around 260g