I don’t know if Sofirn tried different centering ring heights to try and improve the hot spot. I’ll ask them.
Unbelievable that they only got 550 meters with almost 6,000 lumens in a reflector of that size! I was expecting a smaller sized GT70. With only 550 meters throw, this light would be a great flood light but it’s quite wasteful for a single emitter flood light to require such a large diameter head. I wonder if Sofirn measured it incorrectly or is trying to be conservative with their ratings
I recall my first CREE XHP70.2 “thrower”. It was an Acebeam T21 modded with this new LED. It was too floody for my expectations and desire and I sold it. When I watch Charles Bridgtec video of the even bigger reflector Imalent RT70, the end of that fenceline - treeline isn’t impressively reached.
I think my Lumintop BLF GT70 is the very first CREE XHP70.2 flashlight that duplicates the Olight SR90 beam profile. Thick and straight beam - spot does not flood out. :partying_face:
If they stick with OP reflector then they can use old XHP70 emitter to get rid of yellow corona with .2.
But they definietly need to drive it harder like 8-9A to make above 5000 lumens.
I sent them a message if they want to send me a proto with smooth reflector. And I can 3D print multiple centering rings and measuring them what is the best.
In my BLF GT jumped intensity from 900kcd to 1174 kcd just modifying the centering ring thickness.
I R100 resistor modded a Thorfire S70 as and I got 5100 lumens and 87800 cd with 8,2A current draw. And it is a much smaller light.
Please sofirn allow me to help 
This is roughly what I was hoping for too (albeit with absolutely no empirical data to base my wish on. 
)
Some of Sofirn lights were under rated ,is it possible of something different in the way of their measurement.
Beautiful light, not impressed by the output :weary:
I wonder if they would be willing to sell it as a host with a SMO reflector? Please convey to Sofrin that the design is nice, but we need a long range thrower from this. :+1:
I think the throw range depends on how deep the reflector is not how big it it.
No. It depends on area. Double area = double throw.
Throw is actually an effect achieved through proper diameter AND depth, the parabolic equation used to figure the shape of the reflector is paramount to getting the desired result.
the parabolic equation is already designed, it’s not a simple drawing, Sofirn paid for the design, not easy to change.
If anyone can help with a new design of reflector for great throw range, that’s great.
I believe it’s better to release Sofirn version first, then some of you guys help for a BLF version after getting a sample.
Tracy said they tried 4 samples of their 21700 batteries and they got an average of 7,200 lumen!
I am asking if they had to modify the battery tops to make contact or not. Looking at the battery, the positive end is flush with the wrapper, but the negative end is a bit recessed. Maybe the spring pressure is enough to push them together? It is hard to say for sure.
If they can reliably make contact, they may offer their 21700 with the light instead of their 26650.
About the SMO reflector she said:
“The Smooth reflector gives a beam with multi circles and yellow or blue spot in the core. That’s really ugly, you won’t like it. I don’t want to be complained about the beam. And the reflector design is shallow, I told that the throw range won’t be as good as GT. One more question, why the extremely long throw range is that attractive?”
I’m explaining that long throw range is what we prefer even if it doesn’t look pretty on a white wall. I’m trying to get them to try adjusting the centering ring height.
Has anyone experienced a yellow or blue dot in the center of a 70.2? Or rings? This sounds a bit strange to me. I didn’t see any of that when I was adjusting my L6 reflector.
I did say at the start the reflector seems a bit short at 50mm in depth that may be an issue with the throw numbers being so low?
As for the dots and stuff its an issue with the flip chip design its seen on these newer Cree LEDs and is no worse to a XPL2 or XPG3? Maybe its more visible because of the bigger die size?
It’s probably a combination of that, plus being heavy OP, plus low output, plus not being focused just right. Even with all that, 550 meters sounds low.
If Sofirn wanted to make the reflector deeper, I think they can extend the light maybe 10mm-12mm here, then reshape the reflector.
This should not be too difficult and it doesn’t change the look of the light very much. I don’t know if they want to go through the trouble of that, though.
I think the reflector needs another 12mm of depth to equal the proportions of the L6/S70 reflector.
Apparently its not about the size its about how you use it
All as we can do is ask.
I xan’t see well from pics but if the centering ring edge is lower than reflector thickness at hole that can allow light to reach the hole inner side and it can make ugly artifacts. They shold make the centering ring inner edfe higher just a bit to ptotrude in the reflector. Not much just a very tiny bit.
From Sofirn “We tried to make the picture showing the blue spot in the middle of the beam and circles.”
Sofirn SP70 pic.
For comparison, here is my L6.
I think the rings in the corona are being exaggerated by the camera and disappear at longer distances. I would disregard those.
I would disregard any color temperature differences as that can be due to the camera.
I think if they adjust the reflector height they can get rid of that blue dot. My light has a slight yellow dot in the center, but it’s hard to see in the picture and not seen at all at normal distances.
Here is my L6 at distance.
I think Sofirn needs to adjust the reflector height and try it at longer distances.
That is truly just a focusing problem. I told them to sent me a proto and I can 3D print multiple centering ring thicknesses and measure all and choose the best but I think they want to go their way.
I think they may want to produce two versions. One with an OP reflector to sell to the world (for people who care more about a pretty beam and not so much about maximum throw) and one with an SMO reflector for a BLF group buy.
I can see their point of view about not releasing a potentially ugly beam. Even if it doesn’t affect the look at a distance (which this light is designed for) it could be tough on sales if their light becomes infamous for a lousy looking beam.
Hopefully focusing the emitter is possible and will solve the issue.