Well, there’s also the led4power 6x board and Ledil Anna optic, which would make it all the more efficient. And according to djozz test, the SST-40 beats the XP-L in efficiency. Even though the XP-L2 is much better than the XP-L, a comparison with CREE PCT data looks to still favor the SST-40 by a little. But, sadly, led4power doesn’t make his 6x board in 5050 footprint, only 3535 or 4040. So, I guess it’s back to XP-L2 if the 6x board is to be used.