Also, some Sanjay's data suggests that if they aren't the same thing, they are -very- similar. :X
XM 175W 10000K SE 1 ARO 175W Electronic N 69 11342 179 124 1.62 0.3866
XM 175W 10000K SE 1 Icecap 175W Electronic N 70 11047 179 122 1.62 0.3918
Iwasaki 175W 15000K SE 1 ARO 175W Electronic N 86 13794 175 123 1.53 0.4966
Iwasaki 175W 15000K SE 1 Icecap 175W Electronic N 86 14565 165 122 1.53 0.5261
Ushio 175W 10000K SE 1 ARO 175W Electronic N 66 8256 180 122 1.65 0.3667
Ushio 175W 10000K SE 1 Icecap 175W Electronic N 63 8595 179 122 1.62 0.3536
Hamilton 175W 14000K SE 1 ARO 175W Electronic N 48 0 179 123 1.64 0.2715
Hamilton 175W 14000K SE 1 Icecap 175W Electronic N 48 0 178 122 1.63 0.2730