What did you mod today?

That’s awesome Docc! Really good work on improvisation, you’re all set to go into the re-flow business now! :smiley:

Grinded down the zwb2 filter and removed most of the rough machining marks (where the MCPCB is placed).
Today i reflow the UV led and then i have to wait for the driver.


TOD’s hittin’ the mods fast & hard :+1:

Nice work Docc! Really cool what you can do with the glass lenses, neat set up for sure!

Twas a hard mod, TCLO on my zanflare T1!

Changed my D25c (again) to a sst-20 4000k and A6 fet driver. Pretty decent throw for the size of the light.

Putted Luxeon V in a GT mini. measurements coming in the morning. I hope it is around 9A and 2000 lumens.

Start with this:
2226 lumens GT mini

This is a Lumintop GT mini with Andúril firmware and a Luxeon V 4000K led on led4power DTP MCPCB.

GT mini driver:

Needed to grind the New MCPCB because wire holes didn’t match up.

Filed the 3535 centering ring to fit 4040 led


Left is a stock CW GT mini, and right is the Luxeon V GT mini

No picture but I bypassed the driver spring with a 22 AWG wire. Finally it draws 10,4A and puts out 2226 lumens.

Getting ready to reflow some new emitters for my Nichia D4S. Still on the fence about whether to do SST-20 4000K or LH351D (all 90+ CRI). I’m leaning towards the SST-20, but I have two empty MCPCBs so I might give both a try.

In the meantime, I made up a solder paste gerber and cut a stencil to use so I don’t have to fuss with “bonking” the emitters to try and eject excess solder. I’ve posted the gerber, along with a little info about how I cut the stencil on my blog.

Modding my Armytek Tiara A1 light with Samsung LH351D 5000k 90CRI:

cracked the glass then flick the bezel with flat screw driver then the rest pop out nicely. The lens is exactly the same as convoy S2+ (20mm purchase link )

Stock led is XML and it’s different footprint to Samsung LH351D 5000k 90CRI so i use 3535 footprint on14mm MCPB and it fit nicely and screw down perfect.

original parts

Kaaaaching :slight_smile:

close up

:slight_smile:

Will post beam shot tomorrow when i have time. The tint is much more better but on max it is a little less bright compare to XML.

Moding Armytek is abit more friendlier compare to Zebralight.

Nice done Nicolicous. Was thinking of using the LH351D in H03 but i changed to Lexel FET driver. Would drive the led crispy. Where did you get the small MCPCB (is it copper)?

several of us have put LH351D into Q8’s so I don’t think it would be a problem to use it with a FET driver and a moderate to high discharge battery.

I modded Convoy S2+ with triple KD Nichia 4000K MCPCB, Kiriba-ru CU spacer soldered into the original brass pill and Qlite driver, which gives really nice Moonlight mod and around 1000 lumens on High mod. I had also sended down a legs of triple optic (KD one, not Carclo) make the lenght optimal. Nichia gives amazing slightly warm neutral tint, more like 4500-4700K.

In spite of the Samsung LH351D being thought of as a low Vf emitter, in a single emitter single cell light it’s difficult to really push one to it’s limits. I’ve seen around 1600-1700 lumens in such a set-up with a top cell and quality FET. Used em in an Eagle Eye X6, Emisar D1S, and in the GT mini. I tried pushing the GT mini even further by boring the battery tube and using an 20700A cell, but can’t get it to do 2000 regardless. I even put a solid copper disc with copper based spring and a bypass in the tail. Still, it’s a neat look in the beam profile and color, even if ~1800 is all I can get from it.

That’s because the lowest VF emitters are XPL2s and Nichia 219Cs.

The LH351D 70/80CRI only has a bit lower forward voltage than an XPL-HD, at 3,40V/3A for the LH351D vs 3,47V/3A for the XPL-HD.

Only the LH351D 90CRI has a considerably lower forward voltage at 3,28V/3A, but that is still higher than the XP-L2 70CRI at 3,20V/3A.

LH351D 70/80CRI = 3,40V/3A

LH351D 90CRI = 3,28V/3A

XP-L HD = 3,47V/3A

XP-L2 = 3,20V/3A

In a FET config, that means the LH351D is between the XP-L2 and XP-L HD in terms of DD brightness potential, but considerably behind the XP-L2 regardless.

HOWEVER, it is the most efficient 3V 3535 LED if put in a regulated buck/boost driver config in terms of light output.

On my second Sofirn Q8, I have made some progress with the stock light. Out of the box it was making 5775.3 lumens on 30Q cells, it now makes 6379.05 lumens. This gain was through a solid copper disc in the tail end replacing the pcb, with Blue’s large springs and a 20ga bypass. While I have flashed Anduril to the driver, no other changes have been made and the top end of the light still hasn’t been opened up.

I also re-threaded the holes that hold the tail spring board down, used 8-32 machine screws 3/4” long…

Added a screw in marine grade bronze heat sink to help the final build once that’s done. :smiley:

Couple of looks inside, showing the Blue springs….

The bronze heat sink aids in the hold and also locates the switch, so whether or not it actually helps with thermal management it looks cool and serves other functions so it works for me. :smiley:

Sorry i expressed it wrong. Because of the thin material of the H03 (a positiv thing for a headlamp because it makes it light) and the more Amps pulling LH351D it would get way to hot. And i would go from XM-L2 to LH351D 90CRI.
Maybe the led would not get into crispy state, but my forehead would for sure.

The Cu disc looks nice.

Wonder how much slop the springs need to take up. Else instead of using springs, use something like Belleville washers instead, whether BeCu for springiness or something else if better.

Then youse could all go crazy with it!

Since the driver has a brass “donut” for contact, the cells kinda have to be button top. Different cell lengths, protected cells, that’s why the springs in the tail are critical. These large heavy duty copper based springs from Blue’s group buy fit the bill nicely. :slight_smile: I only gained 151 lumens with the bypass.

I’ll go all crazy with it when the replacement emitters arrive. :wink:

Few more low Vf LEDs:

Luxeon V= 3,10V@3A,

Luxeon MZ= 2,93V@3A.