+1 on the Cree XR-E suggestion.
I have found that for some applications the Cree XR-E out-performs the P4. For instance the Blue P4 gives out 38 lumens at 1A, the Cree XR-E gives out 30 at only 350ma with a max drive current at 1A.
Not quite 3x the lumens, but definitely brighter and more efficient at only .5 more for the vf.
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