I’m not aware of one; there isn’t much demand for those. Probably the easiest way to get a diffuser cap for it is to go to a grocery store and look for items which have the same diameter with a clear or white cap. Then go home with a can of peanuts or something.
This can also be a good way to protect the lens while the light is carried in a bag.
This MIGHT work for the diffuser:
https://banggood.app.link/8gDLZ9xya2
I used a code and got it for $2.99 + free shipping, just received it yesterday. I’ll test it on my Astrolux FT03 and let you know. Astrolux FT03 head = 69.5mm / K1 head = 72mm
Good find thanks. Just thinking… the K1 is 2.8mm larger in diameter so thats 8.8mm longer circumfrence, so the silicone that goes over the bezel would have to stretch 8.8mm total. Can you tell me if it is tight or loose on your FT03?
Thanks!
The diffuser fits loose on the FT03 unless you pull it down a little extra and then it’s snug.
It looks like the diffuser was designed for the MF01S which actually has a 72mm head. So the diffuser should fit the K1 well!
It appears the $2.99 code (Coupon: FDIFF) doesn’t work at the moment due to the diffuser being part of a promo.
Just a thought, but for big lights like my D18 and Q8, you can grab some cheap LED replacement bulbs and cut the globe to fit. Pics to follow
You can now order the K1 with SST20 or XPL HI emitters
Thanks for the update!
Great news. Hank, what current is linear driver set up for XP-L HI and SST20 emitters?
Now all versions with lumen and candela infos:
W1 (Osram CSLNM1.TG), 6000K, 650KCD
W2 (Osram CSLPM1.TG), 6000K, 550KCD
XP-L HI V3 1A (1300lm, 290KCD)
XP-L HI V3 3A (1300lm, 290KCD)
XP-L HI V2 5D (1300lm, 290KCD)
SST-20 6500K (1300lm, 330KCD)
SST-20 5000K (1300lm, 330KCD)
SST-20 4000K (850lm, 95 CRI, 230KCD)
SST-20 3000K (850lm, 95 CRI, 230KCD)
The SST-20 5000 K should be a good tradeoff with usable spot and good throw.
Lumen values suggest that it’s probably around 5 A (i.e. the 4.9 A version as Hank wrote in this post).
Thanks for the cross post…
For a thrower, I see only 600kcd+ as an option…
In fact,I wonder if someone in the aftermarket will boost the 650kcd number…I haven’t bought one yet due to the new car, but it’s at the top of my list… we
Not going to happen, you can only achieve this by using a larger reflector
Any updates on the release of the XHP35 version ?
Boost HL could top that. But not by much.
Manual focusing might help some…or not.
Is there like 2% to gain by using UCL2 or a similar lens?
Am I missing something?
Anyway, that’s not much. There are very few stock lights as close to the limit as this one…
In the TLF we got some outdoor beamshots (probably requires registration to see the images in full size): Noctigon K1 | Taschenlampen Forum
Awesome pencil beam. Looks like a lot of fun, but not so useful for real tasks.
Nice beamshots, made an account registration for those 
But you are completely right, i have a L21A with white flat and 5A driver, does about 550+ kCd so its very compareable, its real fun, but not very practical (or should i say useful ?)
Thanks for posting this! I’ve been waiting for some outdoor beamshots.
Thats a good idea Zed, especially for a lantern. I ended up ordering the silicone diffuser from banggood.
I’m not sure how popular these other emitters will be. 290KCD is still very impressive but I bet almost everyone will order W1.
I won’t order W1. I find cool white throwers have more visible backscatter, I don’t find ultra-tiny hotspots all that useful, I’m tired of linear drivers, and I haven’t yet found a light that throws far enough to make me stop caring about CRI.
I’m waiting to see how the XHP35 HI model performs, especially if Hank sources some of the 80 CRI Easywhites, with which I’ve had very good results in other lights in 4000K and 4500K. Barring that, I’d consider SST-20.
Yet none had any linear driver until K1.