COURUI DO1 'Big Head' (Black/GRAY NOW AVAILABLE) $29.99 @ Gearbest ( use coupon: gbcourui) A long-throw modder's light!

[18sixfifty]

I just finished modding one of these and it turned out fantastic. I put a R50 over the resistor, added heavy gauge wire and used silver coated braid for the tailcap springs. I de-domed the emitter and put in on a noctigon. I also changed the centering ring out but I have no idea what ring I used. I always have a bunch of them so I just kept trying different ones until I hit on one that worked right. On the pill, I turned it upside down and lapped the surface with different grits of sandpaper until it was shiny. Then when I put it back in I used a combination of “omegathermal 201” and silicone carbide on the threads and around the bottom for much better heat transfer. Because of the vast discrepancies in testing I am not going to post my lumen count or KCD numbers. I’ll just say it’s Very bright and the beam is perfectly focused. At a quarter mile you can still see the round hotspot on trees. For me that puts the light into the super thrower category. Similar in lumens and throw to a fairly well modded TN31.

[Pulsar13]

I just received mine and finished modding it too.

I remembered member LinusHoffman mentioned this is not a light for a beginner. I found out that is very true.

- The switch came unscrewed (or loosened during mail)

- The switch is very light - too easy accidentally to turn on. Needs washer mod.

- Absolutely tiny wire on the negative terminal - looks like AWG28! Needs some copper.

- High resistance steel spring - needs silicone wire mod.

- Pill has no hole to turn - needs some drilling

- HUGE HUGE thermal sag in the beginning. About 20% output drop in 10s. What were they using? Dang - the star doesn’t even touch the pill! It’s just sitting on top of the very strong epoxy-glue-like-gob. Needs emitter swap - XML2 on copper and proper thermal paste.

- Pill threaded to deeply in - emitter cannot focus properly. Barely touches the reflector. Needs focusing-refocusing by adjusting the pill depth until proper focus is found. CAUTION. Will blast 100+kcd straight to your eye if mod#2 is not done. Trust me

Honestly I was only looking to solder a copper line to the negative terminal - and ended up having to do all of the above. So, yeah, prepare some time if you’re modding this.

In the beginning this is not too spectacular a light. Just around 50kcd and not impressive considering its head size and people’s expentancy.

After initial braiding etc and shorting the resistor - it gets to 100kcd but drops quickly to 80ish - signs of huge thermal sag.

After emitter swap and final tuning, I managed to get 130kcd and it holds steady. Boy I must say this light is impressive. It’s not even dedomed, and I’m already so happy with the throw.

[Werner]

@18sixfifty

used silver coated braid for the tailcap springs

Where did you purchase it and does it work better than the normal silicone wire or copperbraid for deSoldering?

[Tom_E]

@18sixfifty

I just finished modding one of these and it turned out fantastic. I put a R50 over the resistor, added heavy gauge wire and used silver coated braid for the tailcap springs. I de-domed the emitter and put in on a noctigon. I also changed the centering ring out but I have no idea what ring I used. I always have a bunch of them so I just kept trying different ones until I hit on one that worked right. On the pill, I turned it upside down and lapped the surface with different grits of sandpaper until it was shiny. Then when I put it back in I used a combination of “omegathermal 201” and silicone carbide on the threads and around the bottom for much better heat transfer. Because of the vast discrepancies in testing I am not going to post my lumen count or KCD numbers. I’ll just say it’s Very bright and the beam is perfectly focused. At a quarter mile you can still see the round hotspot on trees. For me that puts the light into the super thrower category. Similar in lumens and throw to a fairly well modded TN31.

I'd love to see you post amps (taken anywhere you want) and throw #'s. We will gladly accept "18sixfifty" lumen and kcd #'s . I've been adding a disclaimer when posting #'s - simple CYA. I refuse to let a small minority's (1) objection stop me. Would be interesting to here if someone got over 400 kcd out of one of these...

Silver coated braid? I use 22 or 24 AWG silicone coated wire now, depending on the spring size and seems to hold up much better than braid - I gave up on braid a while back.

[wight]

@Werner

@18sixfifty

used silver coated braid for the tailcap springs

Where did you purchase it and does it work better than the normal silicone wire or copperbraid for deSoldering?

@Tom E

Silver coated braid? I use 22 or 24 AWG silicone coated wire now, depending on the spring size and seems to hold up much better than braid - I gave up on braid a while back.

Here is 18sixfifty’s thread on that subject: No more copper mesh/braid Silver is the way to go!

No more copper mesh/braid Silver is the way to go!

Ok for a while now I've been suing copper braid/mesh like pretty much everyone when doing spring mods. I have been looking at some of my older mods and seeing the green corrosion building up on them gave me second thoughts about continuing to use it. Not that I'm going to go through all my mods and remove it. But from now on out I'm using silver coated copper braid. Kawiboy was kind enough to send me some to try and it's easy to work with, transfers electrical current better and no more need to …

[L4M4]

@Pulsar13

• The switch came unscrewed (or loosened during mail)

- Pill threaded to deeply in - emitter cannot focus properly. Barely touches the reflector. Needs focusing-refocusing by adjusting the pill depth until proper focus is found. CAUTION. Will blast 100+kcd straight to your eye if mod#2 is not done. Trust me

I can confirm both.
The Switch was barely attached and needed some force to go all the way down on mine.
Also switched the tiny wire to some copper strand

Yesterday, I changed the LED with this one .
The contacts of the board (even in original) touch the reflector - so I flattened some thick copper strand with my bench vise and soldered it with that.
Now the reflector can sit much closer to the PCB and this light throws well. It’s spot is now the same size as the Yezl Y3 - just a bit brighter because of “no sense resistor”-mod

unfortunately I dropped the light from my bench and now it has a big dent at the back - but it could be worse.

[gaston01]

@Cereal_killer

This light is a DX courui running BU_CK with an XM-L2 U2 1A dedomed at 7.7A from NCRB’s (no higher power from ICR’s, exactly how it should be). it makes 523kCd!

It is your flashlight? very good number! what else can know about her?

[tatasal]

New modding thread on this Courui (by vestureofblood) to 6 XMLs !!!

Courui DO1 Mod. 6 xml.

Hi all, Here is my contribution to the Courui big head band wagon. I have to say this host is so perfect for modding the hardest part is figuring out which one to build first. The main idea for this build is to have a light that is a few thousand lumens but is well able to maintain that output for extended periods of time. So where to start...? With a big chunk of metal I'd say. [image] [image] After a little trimming here is a picture of the new heat sink…

[garrybunk]

Finally received mine! Very nice looking light. Can't power it up yet and won't have time to mod it for awhile, but I'm excited!

-Garry

[Nightbird95]

Finally received my Gray Courui D01 - 47 days after making the order. It is indeed a very nice looking light and is a good thrower in stock (no mods, not even focus adjustments or thread lubes or spring braids). My tests at 11 meters read 671 lux (81,191 cd) or 570 meters throw.

Here’s my Gray D01 beside my modified SupBeam K40. The K40 is its closest rival in external specs.

Here are the business ends of my Gray D01 and my K40. The D01 has a wider reflector than the K40. When modified similarly, i.e. same dedomed XM-L2, driver amps and AR lens, the D01 should throw better.

And here are the 1.5 meter beam shots of my D01 and K40. The K40 has dedomed XM-L2 T61B and ‘shorted’ sens resistors giving at least 6.1 Amps to the LED.

[rexdog]

Nightbird95,
From where are you going to source the AR lens?

[akoposilester]

i wanted to own one of these baby but i dont want it in stock. so anybody selling dedomed courui?
or any modder who is willing to dedome 1 and i will buy it from them?
shoot me a PM.

thanks.

[DavidEF]

@akoposilester

i wanted to own one of these baby but i dont want it in stock. so anybody selling dedomed courui?
or any modder who is willing to dedome 1 and i will buy it from them?
shoot me a PM.

thanks.

If you’re able to solder leads, you can buy an already dedomed XM-L2 on Noctigon from James3 and switch out.

[garrybunk]

I noticed mine's output looked quite "meh" until I shined it long distance outdoors. Then I was like "holy crap this thing throws!" Mine is still stock and I can't wait to see what it can do modded!

-Garry

[pilotdog68]

@DavidEF

@akoposilester

i wanted to own one of these baby but i dont want it in stock. so anybody selling dedomed courui?
or any modder who is willing to dedome 1 and i will buy it from them?
shoot me a PM.

thanks.

If you’re able to solder leads, you can buy an already dedomed XM-L2 on Noctigon from James3 and switch out.

mtnelectronics.com also sells de-domed emitters, but i’m not sure if he ships to the phillipines

[Nightbird95]

@rexdog

Nightbird95,
From where are you going to source the AR lens?

I don’t have one for my Courui D01 yet and I’m not sure where I can get one

[Jaza]

Check first post

[Nightbird95]

@pilotdog68

@DavidEF

@akoposilester

i wanted to own one of these baby but i dont want it in stock. so anybody selling dedomed courui?
or any modder who is willing to dedome 1 and i will buy it from them?
shoot me a PM.

thanks.

If you’re able to solder leads, you can buy an already dedomed XM-L2 on Noctigon from James3 and switch out.

mtnelectronics.com also sells de-domed emitters, but i’m not sure if he ships to the phillipines

Yes it does but the shipping cost is quite high.

I ordered six Noctigon XP16s from Mountain Electronics last 11 March when I can’t find XP16 DT Copper stars elsewhere. The cost for the 6 XP16s was $8.45 and the shipping was $9.5. I needed the XP16s badly so I went on with the order. :~

[Nightbird95]

@Jaza

Check first post

Thanks! UCLP shipping outside US is very costly though.

[Nightbird95]

@garrybunk

I noticed mine’s output looked quite “meh” until I shined it long distance outdoors. Then I was like “holy crap this thing throws!” Mine is still stock and I can’t wait to see what it can do modded!

-Garry

My D01 in stock form measured 671 lux at 11 meters. This computes to 81,191 cd or 570 meters throw.

Well while waiting for my XP-G2s and 32mm Noctigons, I decided to reflow the stock XM-L2 in 20mm Noctigon, direct-wire the sense resistor and add copper braids last night. That simple mod gave me 953 lux at 11 meters or 115,313 cd or 679 meters throw. It is about the same with my TangsFire HD-2010 with dedomed XM-L2 T6 1B.