Lenny I measured the chip area and it's 1x1mm^2 which would make it 42 mil. Didn't know the rule about "42 mil = 2W, 45 mil = 3W". I have a 620nm red off the same size so this must then be 2W as well.
About the efficiency of the Epileds, you are saying that a luxeon is 2 or 3 times more...