nice comparison 
OT: I can’t help but wonder if optics is your field of expertise? You don’t have to answer - I’m just curious :+1: 
. I am just glad that my observation is no BS & there’s an explanation.
The testing of these lenses itself is quick. It’s all the setting-up and little things I have to watch out for: battery full, light at warm temperature, pointing at exact same location, consistent camera setting, not mixing up the RAW files, etc., that’s tedious and a pain, if I don’t want any error.
I am running one more round of Duv testing of the 219c 5000k this evening then will post beamshots. Strange hobby, could only work at night.
Thanks Jon for the crop. Interesting isn’t it?
I recently replaced 9 of my purple AR lenses with the new Convoy green ones and noticed a slight, but noticeable improvement in the tints.
For my 219B flashlights, it restored them back to their notorious slightly rosy tint. I didn’t replace the purple lens in my 4500K sw45k flashlight since it was already very rosy.
The green lenses also made my 219C, SST-40, and LH351D flashlights just that much better.
Well worth the time and minimal cost to replace them. 
In the past I always replaced the non-AR lenses in my mods with AR lenses to get the maximum lumens, but didn’t consider the impact on tint. Now with the green lenses, there doesn’t seem to be a compromise and may actually be a benefit.
I wish! I'm actually a fourth-year mathematics major in college, though I do enjoy reading about random stuff.
Here's an interesting thought: the low sensitivity of the human eye to blue/red is much like the low sensitivity of the human ear to low frequencies. Thus, perhaps a light with pink tint could be thought of as the visual analogue of bass-boosted headphones...
Your meticulous setup takes a lot of effort, and we really appreciate your doing these tests. Looking forward to your 219C 5000k comparisons!
A big weakness of my testing so far is the comparison is against another brand’s non-fitting large purple lens, not Convoy OEM purple. I actually have bought and am waiting for an Aliexpress small purple lens that fits my S21D, but that is still not Convoy OEM. If you don’t mind sending/”selling” one of those spare purple lenses to me, please PM. My Convoy’s are S21D, M21 B, E, F, but would really like the S21D purple. Thanks.
Oh one of those, Math major, now I understand the precise “language” (a compliment). Mine was Chemistry and I really think I would not have graduated had I chosen either Math or Physics. Also, I thought 1942 was the year of your birth; was thinking I was talking to some old fart, like me. :person_facepalming: :partying_face:
As well as an Opple, I also have a green AR glass Convoy S21E 519A 5700k in the post, that I can compare to a purple AR glass version. Will post the results and photos here.
Thank you! Studying math has definitely helped me with my communication skills. I have so much respect for chem and physics majors--I took both classes at the college level and found them much more difficult; the stuff they do makes math feel concrete in comparison. I actually really enjoy interacting with people from older generations, they always know so much random stuff I can't even imagine...42 is a reference to Douglas Adams's Hitchhiker's Guide to the Galaxy.
Looking forward to stephenk's comparison as well! And can't wait for my green lenses to arrive, the tint shift on my S2+ 519A 5700K triple is killing me.
Sorry, but 8 were the 20.5*1.6mm ar-coated glass lens ,suitable for Convoy S2/S2+/S3/S6/S9 BD03 flashlight and the other was for an S21A (23.2*1.4mm ar-coated glass lens ,suitable for Convoy S21A S21B).
Thanks for checking. I have this one on the way, 23.7 mm. Hopefully it’s the correct size and hopefully it’s a real bad AR purple so I could prove a point, that Convoy AR Green is magical :partying_face: : Page Not Found - Aliexpress.com
Please do! For me it’s important to compare with other people’s results. I am sure you’ll have a lot of fun with the Opple. I’ve gotten better at measuring, and results are more stable and consistent.
BTW a few things I do that have helped for Duv measurements, in case you find it helpful: I keep distance between sensor and light short (1-2 ft) so that it’s easier to keep center of beam on center of sensor and incident angle perpendicular (I’d better be careful with these math terms with QReciprocity42 around. :) ), use a lower brightness level so the light doesn’t step up and down too much (for me Convoy which settles at that 40% level seems easier to work with than Wurkkos & Anduril, which goes up and down a lot), let the light warm up Wurkkos TS21’s Duv for example keeps dropping slowly over the 20 minutes after turn on.
I added to the first page an index of the posts that I’ve wasted the most amount of time on :person_facepalming: . Hope it helps for anyone looking to waste time reading about Convoy.
Has anyone had the chance to compare the 5700K 519A with the 5000K variant?
I’m a bit afraid the 5700K is noticeably rosy while I’m seeking for a more neutral tint.
I have the 5700K and 5000K but can't post comparisons because I don't have enough hosts to build them in. While domed, they are visually completely neutral, not rosy at all. Same goes for all domed 519As, really. It's when you dedome that you see noticeable rosiness.
The Nichia 219c 5000K in my Wurkkos TS21 seems to define daylight neutral tint (why I think it is a must have even though I prefer warmer color), CCT 5000K & sporting Duv –0.0004 at turn on, and –0.0020 after heating up (anything in the teen or below is still very close to BBL). NOTE: I could not remove the OEM non-AR lens so this next comparison is basically various lenses placed OVER it. Not the best, but better than nothing.
For Convoy AR Green lens, I took the lens from my beloved M21E w/ GT-FC40 (the only thrower with Nichia-like tint on market). The rest are UCL lenses from App Chart / Specs. Using a tripod and raising the Opple so sensor matches the light’s hotspot, the numbers have been consistent (also helps that I seemed to spend hours doing it :person_facepalming: ) . Once again the Convoy AR Green seems to be the star of the show. I will post some beamshot next to see how noticeable a 20 point Duv change is around the BBL.
1. Wurkkos OEM (equivalence of “no lens”): –0.0020
2. OEM + Convoy AR Green: *–0.0023*
3. OEM + Wurkkos Non-AR: –0.0018
4. OEM + UCL AR Blue: –0.0016
5. OEM + UCL AR Purple: *~~0.0003* (Duv change 0.0020 ~~ same as with S21D test)
Thank you so much for doing the comparisons!
I totally forgot to account for the fact that a non-coated lens actually changes duv, shifting it toward green, due to iron impurities in the glass! This implies that swapping an uncoated lens for a green AR lens actually reduces more green than just slapping a green AR lens in front of it--in your case, the difference is -0.0005 going from uncoated to green AR, and -0.0003 from nothing to green AR.
Out of curiosity: do you have a pair of AR coated eyeglasses? If so, does it seem to alter tint?
I understand your logic even though I had to go back and forth a few times.
We are very much on the same track. I posted about my AR eyeglasses previously; looking for reassurance that Convoy AR Green is actually doing the right thing. I have several AR pairs accumulated over the years from different brands/manufacturers, without fail, all reflect green when placed under ceiling lights.
For anyone curious about testing your lenses and glasses: I stand under ceiling light and look straight down on the glass looking for reflection. Straight down, NOT at an angle (sometimes green becomes purple, yellow, etc. when you look at an angle). This reflection looks that way because it’s under a chandelier with 6 light bulbs.
Thank you for the reminder--I somehow completely forgot that this thread already contains your test of eyeglasses!
This is EXACTLY why green AR corrects angular tint shift!
This is interesting. I have several Convoy S2+ Hosts I’ve built, and the lenses do not show green or purple, so that means they are not AR. I have one host with Nichia SW45K emitters which I cracked the lens, oops. I ordered a replacement AR Coated lens from Simon on AE and have been using it since with no issues. After reading all this, I just checked and its the Green AR Yay! I have 2 other hosts I’m going to build with SW35k and SW27k so I’m glad I ordered extra lenses. Thank you for all the work you have put into this.
Do you think that the Green AR lenses would have any benefit on lights with Deep Red, Royal Blue or Green emitters or should I just leave the non AR lenses on those?
Green AR lens will have slightly better (probably 3%-ish if I had to guess) transmission than non-coated, but since tint is not a concern for color emitters, it's probably not worth the cost to upgrade.
You’re very welcome. This “green tint” so puzzled me once (because if I just look at the lens, there really is no green “tint”) that I made a youtube video. :partying_face: Much easier to use the ceiling light bulb reflection test. Note that a flat angle you’ll see purple; only when you look straight down on the lens that the green reflection is seen.
I just looked at my result and can’t help but have a chuckle. I appreciate your sharp mind. It’s as if you had looked at my cheat sheet; but actually it makes me feel very good and somewhat assured that my humble home test results are no BS. :partying_face:
1. UCL AR Purple: will set this at 100%
2. UCL AR Blue: 99%
3. Convoy AR Green: *98.5* (3.5 just to exactly match your “ish” lol)
4. Wurkkos Non AR 95%
When it comes to light transmission, for some odd reason the table is turned, oddly in reverse order of Duv listing. The UCL purple was horrible with Duv change but now is the star of the show (btw previously I measured about 98.4% transmission vs no lens using ceiling bounce +*HERE). I did 6 runs with the above test; hotspot on sensor this time (vs ceiling bounce), and the results surprised me with how consistent they were, considering the Wurkkos TS21 is a lousy light to test because of its numerous stepdowns.