This is my entry for the 13th Old Lumens Contest in the Modified Light Category.
I started to built a DDH flashlight host with four LHP73B leds. Pictures will follow soon…
Reserved for the finished flashlight
Ok, here are the pictures of the host and the parts. The host is a Dongdonghai D5D with a quad reflector from the Starfish Z6. These flashlights are available only in China/on Taobao. The D5D unfortunately has been discontinued.
The list of parts so far is:
Starfish Z6 reflector, copper spacer 30mm diameter 5mm thick, four LHP73B 4000K leds, two 7070 MCPCBs, Anduril driver (maybe a different one, not the one in the picture)
I used two special copper MCPCBs with two 7070 footprints on each of them and 1mm thickness.
I cut them in half and smaller with a hacksaw.
Next, I reflowed the 4000K LHP73B onto the MCPCBs.
I drilled two holes in the 30mm copper spacer
I soldered the four MCPCBs on the copper piece using low temperature solder paste.
Test fit 
4 Thanks
I used an Anduril driver from China. The driver was 32mm so I had to file it to 30mm.
I connected the leds with cables between them and obviously also to the driver. I had only very small copper vias to connect the cables so I used some copper tape with Kapton tape underneath to solder the cables. It was very finicky.
You might notice that I used only two centering rings instead of four. That is because the soldering close to the leds was to tall and would allow the centering rings to fit.
After assembly and a bit of troubleshooting the flashlight is up and running. 
3 Thanks
Here are some whitewall beamshots.
The beam has some rings and artifacts but less than I was expecting. Using a smooth reflector with multi die leds is usually not a good idea but it didn’t show a donut hole. There is a dark ring around the bright center, though. The tint of the LHP73B is quite nice.
Some outdoor beamshots (2.5s, f7.1, ISO500):
Control
Modified DDH D5D High
Modified DDH D5D Turbo
Convoy C8+ SFT40 5000K
Emisar D4 SST20 5000K
The modified D5D is really bright and also has some throw. On Turbo it easily reaches the tree in 150m distance. The beamshot location is not ideal because of a bright streetlight illuminating the foreground.
5 Thanks
Great build! 
I specially liked that you used an Anduril driver board, I was not aware that such a thing could be had standalong. What more can you tell us about it? Eg, Anduril 1 or 2? ATTiny85 MCU? Are there flashing pads (can’t see any in the photos)? Link to product?
TIA!
1 Thank
Thanks dmenezes and sorry for the late reply. This Anduril driver board is from China. The improved successor is available here: Superbuy Taobao link
It’s Anduril 1 and Attiny85, no flashing pads. I have to check if I can lower the floor because it starts way too high. These drivers are made mostly for the DDH flashlight hosts.
Nice mod Skylight.
You have to be brave to solder MCPCBs directly onto the spacer!
Do you think you could have filed down the solder around those 2 LEDs in order to make space for the centering rings? Maybe even file down the centering rings a little too?
Thank you! 
Once you soldered the MCPCBs a few times it becomes a standard procedure. I use low temperature solder so that the leds won’t come off.
The reason for the soldering is that while reflowing I had to offset those two leds by 1mm and connect the cables directly to the footprint as there are no other vias. I already had to remove the reflector once to resolder a broken connection. You are right that having four centering rings would be a more elegant solution. But having the reflector press down on these connections through the centering rings would most likely mess up things again.
1 Thank