KawiBoy1428- your post is very informative, thanks!
Check out this graph by Djozz;
Taking into account the voltage sag, you might be lucky to see 5 Amps briefly.....which is why you need the buck driver to get over that, & sustain it.
Now I finally begin to understand it better. I thought ( because I am still a noob) those currents could be achieved with any driver that has a direct drive in the highest mode… Which turned out to be impossible.
On the other hand, I have not(not yet) found anyone who has a flashlight with a xp-l running at 7amps. Which makes me think that there must be a reason to that… It is not a problem at all to order a 7-8amp driver and rewire the cells into a series, but I am not sure it would be reliable. If there is anyone who has a light with a xp-l driven so hard it has the surface brightness ( or whatever it is called) the same as a xp-g2, I will consider using a xp-l emitter again, but until then I will stick with a xp-g2.
Thanks for patience with my inexperience!
Well what Host are you planning on using? I myself have several TK61’s and Couriu’s ,Maxtoch Sniper’s, Jax X6’s, Yezl Y3’s, and HD2010’s……but I think I need a couple M25C2’s Host’s or better for my next Adventure!! What would be your first…….adventure… :bigsmile:
I have no idea what host is suitable. The only host I know of is the Courui Big Head. If there is any other host where a large 86mm reflector can be mounted, let me know! I have not seen many builds with those reflectors. Maybe we should discuss this matter with other recognized modders, their insight and experience with dozens of other flashlights would come in really handy.
maybe a little OT question, but is so much copper heatsinking as many people put in their lights really necessary? And if it is so necessary, why not to mount a small cooling fan right under the pill? The Courui has more than enough room for a fan. Active cooling instead of passive cooling. I mean a tiny 5V powered fan that has 20-35mm in diameter. And put it under the pill. The air circulation should be enough to cool the pill and to convey the excessive heat away from both the underside of the pill and from the driver. It woult turn the entire cavity under the pill into a heatsink. That should help or not?
The problem with the fan is that you are circulating hot air unless you drill air holes and you are taking power from the cell/emitter also so shorter runtimes.
The copper is used to keep the output higher for longer or in extreme cases, stops the solder melting.
As long as you are using DTP board and the pill is not hollow, in most cases copper-everywhere is really not necessary even if you are driving your LED very hard. It is just overkilling for the job.
Active-cooling is also unnecessary unless we are talking about 100W and above of total power (i.e. computer CPU).
thanks for clarification!
Well……Vinz (the guy in Germany) once modded a TN31 (dedomed XP G2, driver modd, spring modd, optimal focussed led) to slightly above 700Kcd………(I think it was 718).
But this requires advanced skills, waaaay too much for me personally. But it can be done.
600Kcd on you budget is going to be quite difficult. You need either a very big reflector or a aespheric lens of the same proportions.
UF-1504 will get you to around 450Kcd, which I would not call “mediocre”.
TK61 with dedomed XM L2 and driver modd will already get you to around 550Kcd, but is much more expensive.
Also the reflector of this light is plastic and difficult to use with an XP G2.
If you can find a used, preferably non functioning SR90 (with ok reflector of course) you could modd that with dedomed XP G2 and get results in the 900Kcd area.
Bottom line: above 500Kcd is gets expensive……
Good luck!
Nico
Would be interesting to see the details of that mod.
I couldn’t find anything approaching that figure in a TN31/K40. Even the ‘VN’ models were reported to be in the 500’s.
There also is a flashlight that can do 800+ kcd if modded. It is TrustFire T-90 2. It can be bought for $120 on alibaba.com
I found it even cheaper, but the seller seems to be a scammer- they offer me this flashlight for $20, have sent me 8 emails so far, and do not mention whether they accept paypal or how much the shipping costs. It all seems fraudulent. Take a look on your own- This product is no longer available.
Wow the TrustFire T-90 2 can do 825kcd
That is the highest I have heard of from a reflector light.
Kenjii is secretive as the CPF boys often are, but i bet he pretty much dropped in a dedomed XP-G2 S4 to get that performance boost over the XP-G2 S2 he used before.
I hope it can be found cheaper somewhere than fasstech’s $195.
Interesting, I wish to read his thread (if he has any) about the build of this light and how did he pick the best LED.
Did he use Wavien Collar? And does it also mean that with TK61 he can manage to mod and make it putting out 900kcd?
He couldn’t have used a collar, that is only for aspheric type lens lights and the TN31 is a reflector light.
I did get a response, i say they are guaranteed a scammer, probably a hacked account or something.
I asked for one with shipping to sweden, they responded with two different quotes from to different emails, $14 or $8 
LOL for a huge package & flashlight………yeah right, so i asked for a paypal invoice because they claimed they offered paypal on there sales page.
Now they tell me no they can’t do paypal because they are over a “limit”. And they wanted a money transfer in western union or TT………SCAM of course. So i said no but i accept aliexpress escrove ;). and they of course declined that because they are fishing for wire transfers.
I reported them to Alibaba, hopefully they get the hackers out of the system.
So STAY AWAY.
Cajampa- Great minds think alike, I reported them as well! 
Oh I’ve missed that, you are right!
I have returned to my old thread with a view to modding a UF 1405. The Courui+ KD reflector will have to wait for a while…
Feel free to say whether it is a bad or a good idea. Here is the plan:
two 4,35 cells in a parallel wired directly with a edomed xp-g2 S4 2b emitter on a 16mm noctigon because newer xp-g2 leds are said to have a higher Vf. “No driver” means the cells will have to be protected. WHat are some good protected 4,35 cells? All protected 4,35 cells on fasttech are sold out, there are only LG ICR18650D1 18650 4.35V 3000mAh cells, but I dont think they are protected.
WHat is your opinion?
What is your target driving current for the XP-G2? 4.5A? 5A?
Seems to me that you plan to push high current through the XP-G2. If that is the case, my advise is to let the batteries stay in series configuration (stock form) and use a high current buck driver, for instance Richard’s 17mm MTN-MAX high profile buck driver, to achieve your goal. With this setup you also don’t need to worry about the discharge capability of the individual battery anymore, in other words high-discharged batteries are no longer compulsory while still driving the XP-G2 real hard. Therefore you are opened to more battery choices.
This is exactly what I do with my 1405. 