Which would be more efficient at 1000lm this or an XHP70.2 on a single cell set up?
The Cree, by far. They are very different types of LEDs though. The 70.x is about 4 times as large as a 519A, has a way larger light emitting surface and way lower light quality. Also, different supply voltages. They need different reflectors/TIRs (or, at least, gaskets) and drivers.
What exactly is your plan?
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Hi I am building a bicycle light. to run off of a single 21700 with an E switch driver. I am looking for something that can run between 500-1500 comfortably. Would the 70.2 not be wasted due to its capability?
If your main goal is efficiency at ~1000lm, and light quality is of lower importance, I would probably opt for a Luminus SFT-70 R70, or Cree XHP50.3 HI R70. Each paired with a 6V 1.5A boost driver. Should be ~1200lm on the SFT-70 6500K, and probably similar on a similarly cool white 50.3 HI. Another good contender is a Cree XM-L3 with a 3A buck driver.
7070 class emitters are a bit more efficient, but in return make finding matching optics that are not huge a pain.
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LED size aside how efficient would the XHP70.2 be with a boost? I want a niceclean floody beam with out rings.