Well Marc E, CCT wise lower kelvin temperatures (cool temperatures) correspond to “warm white” light sources, while higher kelvin temperatures (warmer temperatures) correspond to “cool white” light sources. You can read the color temperature article in Wikipedia.
A few questions for BanL.
The K6 flashlight host looks different between your site and your AliExpress store listings:
http://kaidomain.com/DIY-K6-LED-Flashlight-Host-175mm-x-64mm-Black
https://www.aliexpress.com/item/32845429347.html
Besides the knurling, bezel and tailcap, dimensions are also a little bit different. 
So what are the correct photographs/pictures of the host?
Furthermore, in the site the reflector hole is listed as being ∅9 mm. Looking at the following AE article description picture,
I see the reflector matches the below one in the site:
http://kaidomain.com/S021807-57_8mm-D-x-55mm-H-SMO-Aluminum-Reflector
This reflector has a ∅12.3 mm hole so, what's the deal?
Thanks. 
Aha, of course! I’m so focused on colour temp when i’m on here i forgot Kelvin is an actual temperature unit! Thanks for the reminder 
BanL, what about ∅9 mm reflector hole Osram 3030 gaskets? Can you source them? A suitable gasket for your K6 host I spoke about, let's say. A CSLPM1.TG emitter inside a K6 should make a very throwy torch. 
Hi Barkuti
We don’t get 9mm reflector that is used on 3030 LED.
I will go to test the beam and make the gasket.
Thank you
Ban
I am interested in those gasket.
I would need them as well. If possible to make gaskets for narrower reflector openings also that would be great
BanL already offers gaskets for 3030 leds and ∅7 mm reflector opening:
Given how item information is presented in KD's page, where only a part of the description is shown under the item's picture (see miscellaneous parts, for example), it would be a lot more useful to list gaskets using a different description format. People looking for gaskets mainly look for “a emitter size and/or type gasket for reflector hole diameter”, and so this information should be at the beginning of every gasket description, in my opinion. Item descriptions seem to be limited to 50 useful characters, I have just checked and any long item descriptions measures exactly 52 characters long, including two dots at the end. This way, the description of the above gaskets, which right now looks like
10mm(D) x 0.8mm(T) White Plastic Insulation Gasket..
would, for example, instead say
3030 Osram gaskets for 7mm reflector hole, 10mm(D)..
It is a lot faster to find suitable gaskets this way, and this translates into a better shopping experience in my honest opinion. The character set in the descriptions, though, has something to do with AliExpress.
Mon, 03/30/2020 - 15:49
KD has a global 10% off deal code “mar” valid till the end of March.
Good point Barkuti.
Search and description on KD is not friendly
A thing to point out for BanL, is that Simon Mao (from the Convoy store) has ∅9 mm gaskets for 3030 emitters listed in his shop: Gasket suitable for 3030 LED and 9mm reflector hole. Simon may also be interested in ∅7 mm gaskets for 3030 emitters.
Message to be removed if BanL doesn't likes it. O:)
Tue, 03/31/2020 - 02:25
Sure.
I will improve those keywords on the KD system.
Thank you for your advice.
I really enjoy all of you guys to give me the hints on making everything in an user friendly way.
Thank you
What you think about tint qualithy of the XP-G3 8A3 compared to sst20 3000k
Thought 8A was around 2800k instead of 3200k on your measures
Cheers
I put them away already but from what I remember the XP-G3 has a more noticeable corona and tint shift so I think I recall the SST-20 looks better.
Hope xpg3 still rosy and not greenish at low current
I See that sst20 hd2 was old stock,now are in hb4,so tint less good?
Wellp, I see people often complains about this tint preference thing, and over time I've come to conclude that it really doesn't bothers me much. I prefer close to BBL tints, and certainly don't complain at all seeing the light from my LH351D 4000K CRI90+ flashlights which technically is slightly greenish.
My advice is try one, what can I say. O:)
Quick question here, not exactly because I am interested right now but anyway I think it is good to be known. I saw an S3 21700 host available at Kaidomain some days ago. As options to choose from are orange peel or smooth reflector, and body colors in black, desert sand and purple. Would love to see photographs of the latter two.
HB4 is above the BBL so the DUV is positive.
Hi
I had posted the photo of three different color.
Regards
Ban
Nice! The S3 looks like a great host for gifting lights to “advanced muggles”, aka non-flashoholic but technically competent recipients. Looks like SS bezel and integrated shelf?