Nice testing EasyB! Even with the unavoidable uncertainties it gives the insight that these leds from different manufacturers are all close to each other.
Have someone found good centering ring for these and C8? Im using one from old Fenix right now, but it is for little bigger led and is little difficult to tune up although height is pretty good.
Btw org C8+ with XPL HI 6800lux and now 13200 with 2mm2. Own measurement method, maybe better to say I managed to gain 94%.
There is no from the shelf centering ring for Oslon leds, but if you can find one that fits your reflector and has a square cut-out for a XP-size led, you can make your own second cut-out for the Oslon led at 45 degrees from the XP cut-out using an exacto knife or scalpel, like I did for the mini-GT :
Wow! Nice work :o
djozz, what does the corona look like?
I will have a look again when I use the led in a new host (not in the mini-GT because it has a new led already), but I noticed nothing in the beam that pointed at the rectangular die shape, in this smooth reflector it produces a fine distinct hotspot with limited corona.
Corona in the X6 was round. I guess it makes sense since a reflector takes a circular average of the LED to make the beam. The same reason a square LED makes a round beam. I would expect a slightly distorted spill outline though.
Managed to get pretty good, although could be better.
I may be remembering wrongly. If so, feel free to help me out. 
My understanding has been that a properly focused parabolic reflector takes aim from one central spot. All the light from that one spot forms the hot spot of the beam, and the rest of the light from the die is out of focus. So, the die shape shouldn’t affect the hot spot at all. If it is a particularly well focused reflector, the corona may show some rounded version of the die shape. But it depends also on how bright the spill is, and how it blends from corona to spill.
Not out of focus, but rather off-center.
A rectangular die (right) would make a slightly oblong shaped spot which is not really noticeable because of corona and also the fact that the CSLPM1.TG is fairly close to square.
Today I putted one 1mm2 white flat in a SMO reflector Convoy L6 with short tube and single 26650. You need to wait a day to measure. I’m at work and I only got a little time at home to done measuring while dark but before work.
Edit: added images.
Well, any point that is “off-center” from the focal point is what I’m calling “out of focus”. Perhaps I should have used another word, like “detuned” instead?
No, the projected images of the dies are rotated as you go around the reflector. Make a pinhole in a piece of Al foil and move it around the reflector to see.
They do not rotate.
They get stretched when the angle between the LED and reflector is large (aka near the center of a forward-facing reflector), but they do not rotate.
Try the pinhole experiment I described in the post above to see how it works. Every little part of the reflector projects an image of the die. The parts near the outside project a smaller image and this forms the “hotspot”, the parts of the reflector near the center project a larger image and this is the “corona”. Additionally as you go around the reflector the images rotate, so this is what I mean when I say it takes a circular average around the center of the die.
They do, we discussed this before. Have you tried it?
Yes, they do not rotate.
This is the same for lenses, record reflectors, and forward-facing reflectors.
I will literally upload a video right now for you to see.
what is the best kind of 18650 battery without blowing up this LED?.
panny 18650B 3400 6.6A? 18650 3500 10A?.
thanks
That looks like a lens light. It rotates with a reflector.