Involvement:General (knows how to use it) - Ownership:1 day to 1 week
Has three modes (Hi,Lo,Fast strobe) and mode memory, as advertized.
Fits to my WF-501B (of sku 36356) perfectly.
Nice color (not too blue), bright (though I think not 840lm as described later).
Does not get hot too quickly compared to my P7-CSXO drop-in (in sku 36356).
Fingerprints on the reflector when arrived.
As described in other review, wires from driver to LED looks slightly thin.
In the very center, color is slightly yellowish (not cons, actually).
Using CC/CV 100W power supply, measured 4.09V*2.75A=11W between outer spring and inner spring. With my second-hand 18650, measured 4.02V*2.0A=8W. Assuming driver efficiency
of 70%, estimated total luminosity is 770lm/11W and 600lm/8W. Not bad.
Frequency of low mode is 120Hz, and fast strobe 7.4Hz.
Buy. To me it is nice replacement of my faulty drop-in. Brighter and less hot, has mode memory.
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