Here's a bit of a comparrision of some popular metal halide bulbs (all bulbs are SE 250 watts - Source Sanjay's website/Advanced Aquarist):
Iwasaki 6500K - 705 PAR
Ushio 10000K - 495 PAR
AB 13000K 250 - 577 PAR
XM 10000K 250 - 612 PAR
Here's a breakdown of the ATI brand T5's (all bulbs are 3' 39 watts - Source Grim_Reefer/RC):
Sun Pro - 357
Aquablue - 336
Blue Plus - 311
Actinic - 137
I think those numbers are pretty convincing...
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This and that.
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