At DX - mystery cheap Cree P4 - M839 Compact Cree P4 LED Flashlight?

M839 Compact Cree P4 LED Flashlight

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This looks like it could be suitable for what I'm looking for, a sub $20 Cree to eventually mod out with a green Cree, but who is it?
Seems some sort of unbranded, unknown guy to pop on the scene, but it's a Cree P4.

What about this other confusingly marked Cree? A Buckle, Cree R2, or is it a Q2?
DX Cree R2 Cree LED Buckle Flashlight with Mountain Clip

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Which is better, brigher - P4, R2 or Q2?

I think I've abandoned the E01 idea although it may be a nicer body, because it's not Cree outfitted, can't be made to do so (or so I assume), you're stuck with Nichia, and it's just not bright enough for me.

R2 is better than a Q2, which is better than a P4 in terms of efficiency (brightness)

This type of "what's this?" post belongs in the MarketPlace (if anywhere).

You may consider re-posting it there when the MarketPlace is back up. Meanwhile, I'm closing this thread.