Also an S2 would make more sense than an S2+ because of the deeper reflector (also use an SMO of course)
EDIT : that is not quite true, as said by The_Driver. You’ll have a smaller hotspot but a bigger corona and not more Candela.
oh i didnt know that thanks! So i know intl sells centering rings for the 1mm flat white but only for 7mm reflector hole. what should i use with a 9 mm reflector hole?
No. A deeper reflector just makes the light longer, it does not increase throw in a meaningful way. It does make the hotspot smaller though.
I just installed CSLNM1.TG in s2+. The led is driven at 4.1A and it has 32500cd throw. Not sure how good this results is but this is what i got. I must note that i did the reflow and it is a sloppy job since it is on a XP sized board.
The S2+ reflector is very short though.
Deeper reflectors also give bigger coronas.
It’s all relative 
Yes, the light, that is missing in the hotspot and the spill, has to go somewhere.
The corona is bigger because the deeper reflector is narrower near the LED.
(Deeper reflector is a smaller size parabola)
so bigger corona smaller hot spot.
so smaller hot spot but not more candela because less light is going to the hotspot and more to corona?
Will take few in a few hours, just waiting to get dark outside 
I do not have any C8 with xpl hi but have one with Luxeon V2, here is picture side by side of those two.
Left C8, right S2+
32500 kcd is very respectable for a 20mm reflector, well done!
Candela is only influenced by the front surface area of the reflector (as seen from the position of the hotspot) and the luminance of the LED. The depth of a reflector for a given outer diameter has a neglible effect on the front surface area (because the area of a circle increases with the square of the radius).
How does that translate to meters of range? I’m a tint snob and know little to nothing about candelas, lux etc. so forgive me my ignorance.
Thank you very much for that explanation 
I’ll edit my post so there’s no confusion for other members
The candela still increases a little for a deeper reflector because the unused center hole decreases in size.
It’s probably negligible for a small height difference like the S2/S2+ but it is still incorrect to say it does not increase lux.
Thats why I wrote “not meaningful”, “neglible” ;).
I made a 3.15A S8 but S2+ internals with 1mm2 led and got 30800 cd with Smooth reflector and AR coated lens.
Nice job!
I have been wondering about this… how hard is it to get the CSLNM1.TG on an XP sized board? I know there are issues with excess solder from what I have read…
enough flux is the key so the solder sticks together where it should adhesive forces do the rest
Is it just me, or is it a difficult thing to judge the white flats vs. the black flat? Seems like in theory the white flats should have better throw, but in practical mods, every head to head I've seen the black flat prevails. This thread mostly compares the white flat to the good dedomed XP-G2 but I don't see apples to apples comparison in a real host to the black flat.
I understand the difficulties with the black flat with electrical isolation, but still, in a decent thrower host, has anyone proven the white is better than the black? Is it dependent on the host or maybe spending the time/effort on focusing a white flat for a particular reflector? Why would the white flat be more difficult to focus?