who know this light?
http://dx.com/p/rustu-l3-cree-xm-l-t6-800lm-5-mode-memory-white-flashlight-silver-1-x-18650-170650
looks identical to ultrafire wf504b.
You are correct with your assumption. Is this the one you were refering to. l cant tell you if there is any difference in quality though.