Can I have the code for the HK04 xhp 50.2, thank you.
its not on stock
Has anyone received these lights yet? I’m looking to order one from Fasttech and can’t seem to find any reviews about it.
I was going to attempt this group buy but the price is better from FT….
Maybe I’ll review it when I receive it?
I’m most interested to see the possibility of removing some material to fit 21700’s and also reflowing warmer led’s (Specifically XHP-35Hi’s).
I’ve ordered a while ago from fasttech (xhp50 sand) and I’m quite happy with it. It is awesome powerhouse and beautiful light. Only thing that bothers me little bit is color temp, I like 5000K and lower. For xhp35 you would must change the driver because it’s 12V but I can imagine that with 4x xhp35 4000K, the beam would be just awesome. If you can do it, please share the results 
Awesome to hear, and I think a lot of us feel that way! I’m most happy at 4000k.
I actually didn’t realise this doesn’t come in a 35Hi version.
Maybe they are already using 12v xhp50.2 or they are wired 2S2P. Would you know what type of driver? I’m gonna be looking towards mtnelectronics for a replacement, maybe SRK driver will fit?
It's a FET based driver. I believe it's two channels - a small FET (plus some circuitry) and a double large FET. Thought I posted pics, maybe not yet. I'm still working on modding mine - it's a pretty decent quality small SRK style light (3 batts), stock with the quad XHP50.2 3V's - so yes, its for super high amp 3V LED's with the MCPCB designed for XM footprint LED's (XP-L2, SST-40, XHP50.2, etc.).
Here's some detail shots of the driver. I don't know who designed it. It's similar to a high amp TA driver but instead of using a bank of resistors for the low channel, a small FET is used. Of course on this driver is the support for USB charging as well. The MCU is our beloved ATTiny85 to run Anduril (or NarsilM). The two big FET's (Q1 and Q2) are in parallel, and the Q7 I suspect is a small FET with at least 1 resistor connected before it.
I busted my switch PCB and that's what I'm stuck on - trying to replace it. They used a ridiculous amount of nasty glue on the switch PCB. Like to keep the USB charging LED indicators but I don't have a dual LED control switch PCB -- wish someone had one. Might have to simply repair it but need one of those dual LED parts.
I'd also like to re-flash Anduril but there's no info whatsoever about the exact Anduril config they used. Could experiment -- the thing I mostly need to know is how the config the ramping table for the low channel.
I ordered from fastech and they messed up my order. Sent me the 9000 lumen version instead of 5000 lumen. I then ordered the 5000 thru this thread’s link from banggood and they sent me the correct one. I then ordered the 13000 lumen version from here also and after waiting for 2 months banggood has no idea where it is, no tracking number shown. Anyway between the 5000 and 9000 I’d definitely go for 5000. The lumen level i measured and it’s about right for both but the 5000 version throws farther,( although I’d like the hot spot to be larger, but it throws slightly further than sofirn q8 ), lasts longer of course, and visibly the difference in luminance is not that evident believe it or not . The only thing I don’t like is how wide the overall angle is, I hate blinding everyone on the side.
Thank you! The 3V setup makes much more sense since they can use the same driver, you’ve shed light on that for me. It also makes sense then why 5000k is the lowest color temperature they can offer.
You’ve been so helpful already, I don’t mean to bother, but what diameter do you measure that PCB to be?
Also any chance of cramming some 21700’s in here? I would be willing to mill out some material (if it’s there…that is.)
It’s over my head but i’d love a battery bank function in this light, does that seem possible to add? I’d most likely have to disassemble a light with that circuitry already to learn about and borrow components.
Good luck with the switch replacement, and it seems tracking down the firmware can be quite difficult.
Since they only offer SST-40's and XHP50.2 3V's, yes, the tint offering is limited.
Can't measure the PCB diameter right now.
I'd say the chance of fitting in 21700's is slim to none. I just don't think the diameter of the battery tube could handle it, regardless of the milling work. A triple 21700 might be as wide as a quad 18650 setup. Also not sure the batt+ ring on the driver could fit 21700's either, assuming you get button top 21700's or mod them yourself. Also there would be problems with the length. Haven't check the dims to be sure of this - will do when I get a chance.
Tom E can you take compare image shot of Haikelite HK04 vs Sofirn SP36 if you have it. I am interesting to view size differents between these lights.
Anyone have any beamshots of the XHP50.2? Little to no reviews of this light online
Sorry, got some issue goin on. Maybe today I'll get a chance - yes, I got both but the HK04 is taken apart but probably could still take pics.
Thanks in advance 
. If you can’t take picture of them can you measure body dimensions of Haikelite HK04.
Here it is, measurements below:
Dims (mm) HK04 SP33
Length 139.1 128.0
Tube width 45.9 44.9
Head Diam 56.1 49.1
The HK04 was a struggle to get out the switch, scratched the light shown above. Plan was to sand out the scratch by making the flat surface bare - might come out look'n good that way, not sure. The HK04 sure is a better look'n light with the SS bezel and style. Extra size is a + thermally, - for carry.
Not sure if this link will work to my photo album on the HK04: https://app.photobucket.com/u/TomE2012/a/420c14e6-a1fb-47dd-b4b0-9e1a68955961
PhotoBucket had a recent upgrade and totally screwed up my pics - counts are wrong, pics dropped, pics duped, etc... I restored the HK04 album but uploading is very, very slow.
:beer:
Hey Tom
would you know if the MCPCB on SP36 same as HK04?
You mean in size? Definitely not the same design, not sure off hand bout size.
yeah size.
i suspect they dont match but asking to be sure as i dont have sp36
Thanks TOM E for great post 
I just ordered SP36 host and MCPCB and driver. When they received I can measure diameter of it.
1) Haikelite HK04 (4x XHP50.2 6500k) beamshot
(distance from flashlight to opposite building ~ 150 meters / 400 feet)
2) comparing beamshot of Sofirn SP36 (4x XP-L2) [left] vs Haikelite HK04 (4x XHP50.2) [right]
(side comment: SP36 and HK04 are actually quite similar in body design, although HK04 has a slightly bulkier head portion)
3) Astrolux EC03 (3x XHP50.2 6500k) [left] vs Haikelite HK04 (4x XHP50.2 6500k) [right]
4) Haikelite HK04 (4x XHP50.2 6500k) vs Emisar D18 (18x SST20 "custom mixed-tint" version)
