Convoy S21D w/ legendary Nichia 219b :) - Review & photo comparison w/ Nichia 519a & E21a (in D4V2) & other LED's.

467 posts / 0 new
Last post
QReciprocity42
Online
Last seen: 3 min 26 sec ago
Joined: 07/09/2021 - 22:18
Posts: 182
Location: United States

The data jon_slider linked is very interesting, in contrast to cannga's data, as the purple AR appears to have less of an effect compared to green AR. Perhaps variance between batches is too much to allow a definite conclusion.

cannga
Offline
Last seen: 6 hours 11 min ago
Joined: 01/04/2022 - 15:37
Posts: 693
Location: Palos Verdes, CA
QReciprocity42 wrote:

The data jon_slider linked is very interesting, in contrast to cannga’s data, as the purple AR appears to have less of an effect compared to green AR. Perhaps variance between batches is too much to allow a definite conclusion.

It’s confusing because of the way he presented data, but actually there’s no contradiction. (Jon thanks for the good find.)

I’ll list results that are common to all 3 tests:
1. Green more negative than purple: no contradiction here. Reddit poster’s result is -0.001, Djozz’s is -0.003, and mine is right in the middle -0.002. Coincidental or not they are actually remarkably close.
2. All 3 values are NOT that significant as far as effect on beam color (EDIT: wrong lol, as shown later, yes even 0.002 is a big difference) is concerned. Mainly because they are only third digit after decimal point and of low values (1,2,3).
3. In fact it seems so far ALL of the values listed for non-AR lens, no lens, green lens, purple lens, etc., are in the 0.001-0.003 range of each other (low value, third from decimal). Meaning this type of AR related tint mod is not going to change your beam color significantly.

IMvHO, outside of beamshot /white wall comparison, the best way to gauge Duv effect is to graph them on the BBL curve (NOT listing percentage like reddit’s poster). An example is pic below, where you could see a Duv change of 0.002 doesn’t alter beam color that much. I am actually very curious what the beamshot will show.

Some favorite LED's: Nichia 219b & B35AM (Ra~98 R9~99), Getian GT-FC40 4500k, Luminus SBT90.2

Helpful & xtremely fun accessories: Texas Ace Lumen Tube - Opple Meter 

4 lights I'd buy were I to start again: Here (IMHO)

QReciprocity42
Online
Last seen: 3 min 26 sec ago
Joined: 07/09/2021 - 22:18
Posts: 182
Location: United States

cannga wrote:
It's confusing because of the way he presented data, but actually there's no contradiction. (Jon thanks for the good find.) I'll list results that are common to all 3 tests: *1.* +Green more negative than purple+: no contradiction here. Reddit poster's result is *-0.001*, Djozz's is *-0.003*, and mine is right in the middle *-0.002*. Coincidental or not they are actually remarkably close. *2.* All 3 values are +NOT that significant as far as effect on beam color+ is concerned. Mainly because they are only third digit after decimal point and of low values (1,2,3). *3.* In fact it seems so far ALL of the values listed for non-AR lens, no lens, green lens, purple lens, etc., are in the 0.001-0.003 range of each other (low value, third from decimal). Meaning this type of +AR related tint mod is not going to change+ your beam color significantly. IMvHO, outside of +beamshot+ /white wall comparison, the best way to gauge Duv effect is to +graph them on the BBL+ curve (NOT listing percentage like reddit's poster). An example is pic below, where you could see a Duv change of 0.002 doesn't alter beam color that much. I am actually very curious what the beamshot will show. !https://i.imgur.com/Twin4eu.jpg!

Thank you for the summary and sharing your perspective! I will add some of my thoughts...

I completely agree with Claim 1, and don't have enough info to comment much on Claims 2 and 3. I suspect that some really bad purple lenses I have incur a more than +0.003 shift, but don't have the equipment to tell. I might also add that the threshold for significance might depend on how tint-snobby someone is, and I personally find a change on the order of +/-0.003 very noticeable even without comparison, if the emitter is close to neutral.

I agree that there is no contradiction, but do maintain that there is inconsistency between batches. I am comparing the absolute-differences |Green - None| and |Purple - None|, and for the reddit data the green absolute change is greater, while from your tests the purple change is greater.

I do agree with you that plotting in color space is an excellent way to gauge duv, but I think the choice of 219B is suboptimal--I find the existing tint deviation of the 219B too large, on the order of 0.01. On that note, I would love to see plots of your 519A tests in color space!

I will respectfully argue that percentages are a very helpful way to gauge duv in practical terms. On a related note, I claim that the implicit question "is +0.003 duv significant?" is ill-posed without reference to the initial duv before the change. If an emitter starts off close to neutral, +0.003 would be a huge percentage of the existing deviation, and I feel many tint snobs will spot the difference. However, if an emitter starts off pure pink, +0.003 constitutes a very small percentage of existing deviation and would not result in a very noticeable difference: lots of pink plus a bit of green is still lots of pink.

I will go back to a previous analogy: is +10 lumens significant? Yes, if your light is currently off, which corresponds to an infinite-percentage increase. Arguably no, if your light is already at 1000lumens--I doubt many would notice the 1% increase.

cannga
Offline
Last seen: 6 hours 11 min ago
Joined: 01/04/2022 - 15:37
Posts: 693
Location: Palos Verdes, CA

Thank you for the thoughtful discussion. I will try to clarify and hope I don’t lose everyone. Facepalm Smile

Sorry but your analogy of Duv with lumen doesn’t hold well, and I mention this only because it is related to the point I was trying to get across about reddit poster’s listing % change of Duv (no one does this I don’t think). Yes with lumen, percentage calculation is ok, because lumen is an amount. A LED with 1000 lumens has 100% more brightness than a LED with 500 lumens, etc.. However, Duv is a number along a line on a curve graphed by x,y coordinates. There is no LED with negative lumen rating, but all LED’s have positive and negative Duv for this same reason.

QReciprocity42 wrote:
… If an emitter starts off close to neutral, +0.003 would be a huge percentage of the existing deviation, and I feel many tint snobs will spot the difference. However, if an emitter starts off pure pink, +0.003 constitutes a very small percentage of existing deviation and would not result in a very noticeable difference

I understand, but this is not quite true. A 0.003 change is the same change whether you are at 0.0001 Duv or 0.120 Duv. The pic below is my 219b 4500K with Duv -0.012, on which I’ve added additional Duv points. I hope it would make more sense than my writing.
One point is valid: I stand corrected and should have written: a 0.002 is a relatively small change, since “small” is so subjective, and small or not, a change in beam color has been noticed by various reviewers (see stephenk’s note above). Hope this helps to clarify & cheers.

Some favorite LED's: Nichia 219b & B35AM (Ra~98 R9~99), Getian GT-FC40 4500k, Luminus SBT90.2

Helpful & xtremely fun accessories: Texas Ace Lumen Tube - Opple Meter 

4 lights I'd buy were I to start again: Here (IMHO)

QReciprocity42
Online
Last seen: 3 min 26 sec ago
Joined: 07/09/2021 - 22:18
Posts: 182
Location: United States

cannga wrote:
Sorry but your analogy of Duv with lumen doesn't hold well, and I mention this only because it is related to the point I was trying to get across about reddit poster's listing % change of Duv (no one does this I don't think). Yes with lumen, percentage calculation is ok, because +lumen is an amount+. A LED with 1000 lumens has 100% more brightness than a LED with 500 lumens, etc.. However, +Duv is a number along a line+ on a curve graphed by x,y coordinates. There is no LED with negative lumen rating, but all LED's have positive and negative Duv for this same reason.

This is an excellent point! My lumens analogy with duv is not an accurate one. Subjectively, however, I still find that the same duv difference is more pronounced when a source is close to neutral. I've played with the color space calculators from Waveform Lighting before, but thank you for introducing it anyways; it's an excellent resource.

After playing more with the calculators, I've created the following experiment for everyone to decide for themselves. It's not perfect, as the computer monitor does a poor job of recreating colors, but hopefully there is something to be observed. In the image below, all 4 sources are at 4500K CCT. Compare the top two squares, and then the bottom two. Try to decide: which pair has the greater difference in duv?

https://imgur.com/a/rI4SjH8

The duvs differences are about equal. (0.0098 for top, 0.01 for bottom)

cannga
Offline
Last seen: 6 hours 11 min ago
Joined: 01/04/2022 - 15:37
Posts: 693
Location: Palos Verdes, CA

@QR, I appreciate that you put a lot of thought (and “work”) into every post Thumbs Up .

For anyone new to this and wondering what on earth we are talking about, if you like to try, Waveform Lighting calculator web site is HERE. It would get you “deeper” into the hobby and believe or not, A LOT OF FUN. Guaranteed lol.

The numbers come from this inexpensive device “Opple Light Master Version 3 (aka Pro)”. It’s the more expensive $40 item – do NOT get the cheaper Version 2. https://www.aliexpress.com/item/3256803116495145.html?albagn=888888&src=...

Some favorite LED's: Nichia 219b & B35AM (Ra~98 R9~99), Getian GT-FC40 4500k, Luminus SBT90.2

Helpful & xtremely fun accessories: Texas Ace Lumen Tube - Opple Meter 

4 lights I'd buy were I to start again: Here (IMHO)

stephenk
stephenk's picture
Offline
Last seen: 3 hours 57 min ago
Joined: 01/30/2016 - 05:09
Posts: 2343
Location: Australia

Just purchased the Opple Lightmaster 3 Pro. Look what you just made me do!

cannga
Offline
Last seen: 6 hours 11 min ago
Joined: 01/04/2022 - 15:37
Posts: 693
Location: Palos Verdes, CA

@stephenk lol coming from you I’ll take it as a compliment Thumbs Up Smile .

Some favorite LED's: Nichia 219b & B35AM (Ra~98 R9~99), Getian GT-FC40 4500k, Luminus SBT90.2

Helpful & xtremely fun accessories: Texas Ace Lumen Tube - Opple Meter 

4 lights I'd buy were I to start again: Here (IMHO)

raccoon city
raccoon city's picture
Offline
Last seen: 2 hours 46 min ago
Joined: 10/06/2010 - 02:35
Posts: 19513
Location: Palm Desert CA ~ West Coast is the best coast

stephenk has over 2000 posts...

and I just noticed his username.  :FACEPALM:

Are you a fan of Stephen King perchance?

cannga
Offline
Last seen: 6 hours 11 min ago
Joined: 01/04/2022 - 15:37
Posts: 693
Location: Palos Verdes, CA

cannga wrote:

Duv values for Convoy S21D with Nichia 219b 4500K
The color refers to a reflection of ceiling light bulb on the lens, NOT any tint I could see…

1. No lens: -0.0127
2. Convoy AR Green-reflection lens : -0.0124 CCT 4471
3. Wurkkos Non-AR: -0.0123
4. UCL AR Blue: -0.0123
5. UCL AR Purple: -0.0102 (Duv change: ~0.0020 more positive) CCT 4365

I find it interesting that the lens with the highest transmission rate, UCL Purple, is also the one that affects Duv the most. Next – beamshots to see if this difference matters in real life scenes.

Beamshot of Convoy AR Green vs UCL AR Purple. Picture shot in RAW format with DSLR. Manual setting & WB @ 5000K. Both light and camera on tripod to minimize fluctuation. I noticed something that’s not frequently mentioned, that changing lenses not only affects Duv, but also shifts CCT about 50-100.

I hope you could see the UCL purple lens makes the scene more yellowish (attention to the white wall @ middle of the picture) but please keep in mind photography tends to exaggerate difference IMHO/experience. In real life use, I could see this difference against a white wall but it’s not as severe as this picture would indicate, and much harder to see when shining on darker subjects with colors instead of a white wall.

Even though this is comparison against a UCL AR Purple, not original Convoy AR Purple lens (I couldn’t find one to buy), I am glad that all my Convoy lenses have green reflection. Innocent It does magically remove yellow tint from a scene.

Some favorite LED's: Nichia 219b & B35AM (Ra~98 R9~99), Getian GT-FC40 4500k, Luminus SBT90.2

Helpful & xtremely fun accessories: Texas Ace Lumen Tube - Opple Meter 

4 lights I'd buy were I to start again: Here (IMHO)

QReciprocity42
Online
Last seen: 3 min 26 sec ago
Joined: 07/09/2021 - 22:18
Posts: 182
Location: United States

Thank you for the wall beamshots, and for the enlightening discussion! The difference between the two seems pretty remarkable. Also very interesting observation about how CCT drops with increased duv--I suspect it's due to the fact that in the CIE 1931 color space, isotherms are not orthogonal to lines of constant duv. It's very strange that the CCT assigned to a point is NOT the closest point on the BBL by Euclidean distance--could someone explain why they made it so?

I also noticed how difficult it is for white to look white at warmer temps...neutral looks yellow-green, while -duv looks peachy or brown or skin-toned, there is just no white.

The nicest warm white I've ever seen came from some fridge bulbs, which are incandescent, heavily-frosted, and noticeably magenta instead of neutral--I'm not sure what filter they added to make them that way, but the tint is just pure awesome, with extremely good reds that beat any unfiltered incandescent and even my dedomed 519As. And it actually makes white things look white even at 3500ish K.

poohduck
Offline
Last seen: 5 hours 6 min ago
Joined: 08/18/2022 - 08:07
Posts: 81

Has anyone seen the wide range of options available (219b, 519a, XPL HD, 8 emitter colours, 8 x different degree options) at flashlightbrand.com?

I came across it after watching a Weerapat Kiatdumrong review on a different light, but the size comparison was with the 21D which caught my interest.

There is a note re the driver differences:

“12A FET driver ,max output 12A,It is greatly affected by the battery voltage and internal resistance, and the current drops rapidly.

8A CC driver, constant current buck driver, As long as the battery voltage is greater than the LED VF value, the driver still maintains a high current output.In addition, the new 8A driver uses springs instead of copper posts.”

I would go for the lower amp driver anyway for less heat. It also sounds as though with the 8A driver uses a spring at the head, instead of a post – this also appeals to me; I’m considering something like this for a bike light / edc.

If I could ask some questions here, I’m guessing at some things without actually knowing:

1. I’m not sure I understand the “degree bead” options. This looks like a wide angle setup – what option would give the most throw here?
2. Being a flashlight Philistine I’m just after the best light to light things up; which would be the best emitter?
3. If I wasn’t a flashlight Philistine, which would be the favored 519a color (4500?)?

https://www.flashlightbrand.com/convoy-s21d-219b-519a-xpl-hd-led-12group...

nicodimus22
Online
Last seen: 4 min 38 sec ago
Joined: 05/02/2022 - 23:11
Posts: 166
Location: Maryland

poohduck wrote:

1. I’m not sure I understand the “degree bead” options. This looks like a wide angle setup – what option would give the most throw here?
2. Being a flashlight Philistine I’m just after the best light to light things up; which would be the best emitter?
3. If I wasn’t a flashlight Philistine, which would be the favored 519a color (4500?)?

1. 10 is the narrowest beam, 60 is the widest. Even with the 10, it’s not exactly a throwy flashlight, though.
2. 519A has great brightness, tint, and CRI. Most other emitters only have two of the three.
3. That depends on your taste. 4500K is what I like, although 5000K is all right indoors too. You might like something way different, but 4500K is probably a safe starting point for a lot of people.

poohduck
Offline
Last seen: 5 hours 6 min ago
Joined: 08/18/2022 - 08:07
Posts: 81

nicodimus22 wrote:
poohduck wrote:

1. I’m not sure I understand the “degree bead” options. This looks like a wide angle setup – what option would give the most throw here?
2. Being a flashlight Philistine I’m just after the best light to light things up; which would be the best emitter?
3. If I wasn’t a flashlight Philistine, which would be the favored 519a color (4500?)?

1. 10 is the narrowest beam, 60 is the widest. Even with the 10, it’s not exactly a throwy flashlight, though.
2. 519A has great brightness, tint, and CRI. Most other emitters only have two of the three.
3. That depends on your taste. 4500K is what I like, although 5000K is all right indoors too. You might like something way different, but 4500K is probably a safe starting point for a lot of people.

Thanks for that nicodimus22

LTC
Offline
Last seen: 3 weeks 2 days ago
Joined: 07/29/2019 - 04:34
Posts: 404
Location: AMK, SG

I’m not sure if you have look around, short list and choose a S21D-a light with TIR for a bike light.

Or at some point, you are confuse while reading this thread.

Imho, take a look at the S12 triple emitter with 519A-8A driver. It’s more appropriate then the S21D for a bike light.

poohduck wrote:
Has anyone seen the wide range of options available (219b, 519a, XPL HD, 8 emitter colours, 8 x different degree options) at flashlightbrand.com?

I came across it after watching a Weerapat Kiatdumrong review on a different light, but the size comparison was with the 21D which caught my interest.

There is a note re the driver differences:

“12A FET driver ,max output 12A,It is greatly affected by the battery voltage and internal resistance, and the current drops rapidly.

8A CC driver, constant current buck driver, As long as the battery voltage is greater than the LED VF value, the driver still maintains a high current output.In addition, the new 8A driver uses springs instead of copper posts.”

I would go for the lower amp driver anyway for less heat. It also sounds as though with the 8A driver uses a spring at the head, instead of a post – this also appeals to me; I’m considering something like this for a bike light / edc.

If I could ask some questions here, I’m guessing at some things without actually knowing:

1. I’m not sure I understand the “degree bead” options. This looks like a wide angle setup – what option would give the most throw here?
2. Being a flashlight Philistine I’m just after the best light to light things up; which would be the best emitter?
3. If I wasn’t a flashlight Philistine, which would be the favored 519a color (4500?)?

https://www.flashlightbrand.com/convoy-s21d-219b-519a-xpl-hd-led-12group...

poohduck
Offline
Last seen: 5 hours 6 min ago
Joined: 08/18/2022 - 08:07
Posts: 81

I will, thank you

cannga
Offline
Last seen: 6 hours 11 min ago
Joined: 01/04/2022 - 15:37
Posts: 693
Location: Palos Verdes, CA

I was thinking the same thing. Bike light probably has specific requirements such as certain brightness and not shining on eyes of people in opposite direction, etc., and the S21D with Nichia (lowish brightness and throw, no easy control of direction) is probably not the best candidate, as nutty as I am about it Smile .

Some favorite LED's: Nichia 219b & B35AM (Ra~98 R9~99), Getian GT-FC40 4500k, Luminus SBT90.2

Helpful & xtremely fun accessories: Texas Ace Lumen Tube - Opple Meter 

4 lights I'd buy were I to start again: Here (IMHO)

cannga
Offline
Last seen: 6 hours 11 min ago
Joined: 01/04/2022 - 15:37
Posts: 693
Location: Palos Verdes, CA

BTW the picture shows why I feel confident about Duv numbers from my Convoy AR Green Tint lens’s comparison. IMHO, the Opple’s number one “enemy” is change of position and angle between light and sensor. While there is nothing wrong with hand holding for quick reads, for me the only way to prevent fluctuation and improve repeatability is tripod use.

It turns out one weakness of my test, I couldn’t find the original “bad” Convoy AR Purple to buy and have to use the larger UCL Purple, is the same reason it is consistent, down to 4th significant figure of X,Y coordinates. I just hold the lens in front and record numbers. Moving it off shows instantaneous change, without touching the light. Where other testers may record one number, I could do 10 instant A:B comparisons (the best kind of comparison IMHO) without much effort.

To me the Opple is a garbage-in garbage-out type of device, if you want accurate comparison test, nothing beats repetition and nutty OCD. I have a nerdy notebook with pages of data to prove. Thumbs Up Smile

Some favorite LED's: Nichia 219b & B35AM (Ra~98 R9~99), Getian GT-FC40 4500k, Luminus SBT90.2

Helpful & xtremely fun accessories: Texas Ace Lumen Tube - Opple Meter 

4 lights I'd buy were I to start again: Here (IMHO)

cannga
Offline
Last seen: 6 hours 11 min ago
Joined: 01/04/2022 - 15:37
Posts: 693
Location: Palos Verdes, CA

For me photography is the final arbitrator – to answer the question “is there a difference.” I was happy that the beamshots support Opple measurements so closely.

We’ve seen Convoy AC Green vs UCL AC Purple and the rather remarkable effect of a 0.002 Duv change. I was also curious about Convoy AC Green vs NO LENS. Nearly identical Duv. No point to post BBL graph because they occupy basically the same spot.

But what about beamshot – as expected by the nearly identical Duv, the beamshot of Green vs No Lens are very, very close, but not quite the same to my eyes. But… I’ll let you decide for yourself. Is Convoy AC Green that magical, “better” than no lens? Smile

Repost of Convoy Green vs UCL AC Purple for comparison (much larger Duv change here)

Some favorite LED's: Nichia 219b & B35AM (Ra~98 R9~99), Getian GT-FC40 4500k, Luminus SBT90.2

Helpful & xtremely fun accessories: Texas Ace Lumen Tube - Opple Meter 

4 lights I'd buy were I to start again: Here (IMHO)

QReciprocity42
Online
Last seen: 3 min 26 sec ago
Joined: 07/09/2021 - 22:18
Posts: 182
Location: United States

Thank you so much for posting the comparison wallshots! The green coating really does make a difference over no coating, to my eyes at least. If you had shown me just the centers of the two beams, I probably won't be able to tell. But with the edges of the beams also in frame, the reduced tint shift from green coating is more obvious.

cannga
Offline
Last seen: 6 hours 11 min ago
Joined: 01/04/2022 - 15:37
Posts: 693
Location: Palos Verdes, CA

@QReciprocity42 thanks for the nice comment. The comparison test took a lot of time and effort so it’s good someone besides me is enjoying it Smile . The change in color of the beamshots is subtle yet still took me by surprise, especially Green versus NO LENS where Duv are so close I didn’t expect to see a difference. BTW I took 2 shots with each lens and did two rounds. The second round shows the same extremely subtle but noticeable change.

Another interesting note is UCL Purple was clearly worst wrt Duv, but best with light transmission. It consistently has highest brightness among the three TS30S lenses.

In earlier post above you were discussing change of Duv of a LED far from the BBL versus one close to the BBL. I happen to have a light that would be a good candidate to do that comparison with actual beamshots, my Wurkkos with Nichia 219c 5000k. This LED is much closer to the BBL than the very negative 219b.

Some favorite LED's: Nichia 219b & B35AM (Ra~98 R9~99), Getian GT-FC40 4500k, Luminus SBT90.2

Helpful & xtremely fun accessories: Texas Ace Lumen Tube - Opple Meter 

4 lights I'd buy were I to start again: Here (IMHO)

QReciprocity42
Online
Last seen: 3 min 26 sec ago
Joined: 07/09/2021 - 22:18
Posts: 182
Location: United States

I am not surprised that the purple AR has the greatest lumen count, since for the same radiometric amount of light, purple contributes a lot less to the lumen count than green, as the luminosity function on the visible spectrum peaks at green and decays quickly at the tails, which are blue and red.

I would be extremely interested to see the duv change comparison around or far from the BBL, and agree that your 219C sample is a good candidate. Though I do recognize how much work and effort it takes to make these comparison shots.

jon_slider
jon_slider's picture
Offline
Last seen: 2 hours 25 min ago
Joined: 09/08/2015 - 12:20
Posts: 6749
Location: Central North America

cannga wrote:
.
nice comparison Wink
cannga
Offline
Last seen: 6 hours 11 min ago
Joined: 01/04/2022 - 15:37
Posts: 693
Location: Palos Verdes, CA
QReciprocity42 wrote:

I am not surprised that the purple AR has the greatest lumen count, since for the same radiometric amount of light, purple contributes a lot less to the lumen count than green, as the luminosity function on the visible spectrum peaks at green and decays quickly at the tails, which are blue and red.

OT: I can’t help but wonder if optics is your field of expertise? You don’t have to answer – I’m just curious Thumbs Up Smile . 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?

Some favorite LED's: Nichia 219b & B35AM (Ra~98 R9~99), Getian GT-FC40 4500k, Luminus SBT90.2

Helpful & xtremely fun accessories: Texas Ace Lumen Tube - Opple Meter 

4 lights I'd buy were I to start again: Here (IMHO)

NeutralFan
NeutralFan's picture
Offline
Last seen: 1 day 5 hours ago
Joined: 03/20/2014 - 19:22
Posts: 2060
Location: Wisconsin, USA

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. Beer

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’d rather use my flashlight around the house than turn on the lights.

QReciprocity42
Online
Last seen: 3 min 26 sec ago
Joined: 07/09/2021 - 22:18
Posts: 182
Location: United States

cannga wrote:

OT: I can't help but wonder if optics is your field of expertise? You don't have to answer - I'm just curious Thumbs Up Smile .

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!

 

 

cannga
Offline
Last seen: 6 hours 11 min ago
Joined: 01/04/2022 - 15:37
Posts: 693
Location: Palos Verdes, CA
NeutralFan wrote:
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.

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.

QReciprocity42 wrote:
I wish! I’m actually a fourth-year mathematics major in college, though I do enjoy reading about random stuff.

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. Facepalm Party

Some favorite LED's: Nichia 219b & B35AM (Ra~98 R9~99), Getian GT-FC40 4500k, Luminus SBT90.2

Helpful & xtremely fun accessories: Texas Ace Lumen Tube - Opple Meter 

4 lights I'd buy were I to start again: Here (IMHO)

stephenk
stephenk's picture
Offline
Last seen: 3 hours 57 min ago
Joined: 01/30/2016 - 05:09
Posts: 2343
Location: Australia

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.

QReciprocity42
Online
Last seen: 3 min 26 sec ago
Joined: 07/09/2021 - 22:18
Posts: 182
Location: United States

cannga wrote:
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. Facepalm ^:)

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.

 

 

 

NeutralFan
NeutralFan's picture
Offline
Last seen: 1 day 5 hours ago
Joined: 03/20/2014 - 19:22
Posts: 2060
Location: Wisconsin, USA
cannga wrote:
NeutralFan wrote:
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.

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.

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).

I’d rather use my flashlight around the house than turn on the lights.

Pages