You have to get inside the front with a pair of very pointy needlenose pliers spread wide, and unscrew a retaining ring that holds the lens in place.
Look for four little half-circle notches in the black ring around the lens.
Then there’s one of those wide flat retaining rings with a center hole for the LED and 2 holes for the needlenose to unscrew, to get to the emitter.
Thanks! I did send up finding this info elsewhere but good to have the info in multiple places as you never know what people might search for. In my case that retaining ring for the LED to the pill was glued so this should be a consideration
The lens you linked is molded, like any of the lenses used in flashlights and that are sold by the usual chinese vendors, do not not necessarily expect a better performance than the stock lens.
The glass lenses used in flahslights are all manufactured as condensor lenses, which do not need high optical performance so a cheap molded lens is good enough. However, in flashlights they are used as projection lenses, for that application the optical quality does matter. An optical grade aspheric lens which is ground to shape does improve performance, but they are much more expensive and can not be found for cheap at aliexpress or ebay. You can find them for a considerable price at optics sellers like Edmund, Thorlabs and such.
No worries djozz, I said “some”. With such a wide projection lens, effective throw may not even reach to that of an XM-L driven a 7-8W under an aspheric, though it should provide 4x+ light corridor surface, which certainly may be nice for certain applications. Should make a pleasant uniform light distribution flooder. :-)
Got mine in. Really nice! Measured 864 lumens (@30s), 43 kcd (taken at 5m) stock - really good #'s for a stock zoomie of this size, and about matches what they claimed in lumens of 880.
I posted this in this thread: https://budgetlightforum.com/t/-/42053, but I got mine in from GearBest as noted above, but can't budge the lens retaining ring - using a lot of force with appropriate sized needlenose, all in the CCW (normal) direction. Nothing - not budging... Any ideas?
It's really a gorgeous zoomie. Just went for a walk past dusk - used my Skilhunt H15 w/Narsil w/nice NW - U3 3D, and a ThorFire BD04 with a dedomed XPL V6 0D, and both worked great, but ended up using the BD04 mostly running Biscotti, 3A. Love flood for the walking in front of you, immediately up ahead, then zoom out to look up the trails, plus the 5 modes worked out great. I'd prefer though a quality zoomie, easy slide like the BD04 but with an e-switch to run Narsil - best of both.
No expert in optics but, with that focal lenght, directly captures more than 110° of an emitter's spatial light distribution fully focused (2arctan(r/fl), if I am not mistaken). For emitters like XP-G3 and XHP70's, this means about ≈80.54% of the light gets through the lens (2.93 out of 15.06 units of luminous flux lost).