$100 Budget SUPER-LIGHTS w/ 15000+ lumens: Wurkkos TS32-Nichia 519a vs. Haikelite HK05, JKK76, Nightwatch Chaos w/ Chinese LEDs

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cannga
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$100 Budget SUPER-LIGHTS w/ 15000+ lumens: Wurkkos TS32-Nichia 519a vs. Haikelite HK05, JKK76, Nightwatch Chaos w/ Chinese LEDs

**In retrospect my flashlight education has gone through 3 phases (sorry for the long first post and wow what a world cup final!!):
1. Newbie me’s Phase 1: Top class CRI & R9 Nichia flooders: Close range flooders with beautiful and accurate color rendition. These are my Convoy S21D’s & Emisar D4V2’s, discussed here .
2. Phase 2 High CRI all-around everyday light: Mid-range flood-and-throw combo’s with equally wonderful color rendition, perfect for hobbyists and muggles alike. These are my Convoy M21B-E-F with Getian GT-FC40, discussed here .
3. Phase 3 What-CRI-? Throwers: Pocketable 1-batttery lights such as Wurkkos TS30 and Sofirn IF22a. The lower CRI does NOT mean they’re not fun or helpful lights, in some aspect for example the 1 km throw of Wurkkos, quite the opposite. These lights are discussed here .

My phase 4 is the exploration into what I call “super-lights” which in my mind is any light with monster lumen output and/or killer throw. Two important caveats however: I prefer not to spend more than $100 for lights, and at this price, plus the law of physics, for these budget super-lights I’ve adjusted my expectations accordingly. I don’t mind 1 minute Turbo step-down, or “tier 2” construction quality, as long as the light has no fatal problem. My typical use would be lower light level during my walk, interrupted by brief OMG all-out blasts for fun or safety check. Sustained all-out brightness all the time is not what I expect. At any rate, if your priorities or expectations are different from above, I’m afraid these lights may not be for you.

I have a few more of these super-lights coming besides Wurkkos TS32 such as Haikelite HK05, JKK76, Mateminco PD90S, etc., and was planning to open the TS32 self-gift on Christmas day. But the Wurkkos is on sale with a huge discount that brings it to below $100, and I feel un-easy talking about it without at least some preliminary check. So yesterday I cracked the box, and turned this baby on. Hopefully the result would help you to not miss the sale.
 
Single SFT40 light is common, but the ingenuity of combining it with 14000 lumens of Nichia goodness (a collective BLF idea) makes the TS32 very much a unicorn and is the prime reason I bought it. What’s special about the light, besides the great decision of combining 12 Nichia 519a for flood and an SFT40 for throw, is it’s a result of Terry @ Wurkkos working with Budgetlightforum click here. So yes this is a “local” product, entirely BLF born and bred Thumbs Up .  

Looking at the Terry’s BLF thread quoted in paragraph above, there have been three different versions of the TS32: 1st XP-L2 × 12 emitters, then LH351D x 12, then fortunately, this incredibly unique version of 519a 5000k x 12. I have other flashlights with 519a 4500k, but the 4500k CCT in 519a is just a little too warm for me. This 5000k CCT version seems to hit the sweet spot, warm but not too yellow. BTW, there is a fantastic review of TS32 on 1lumen if you want to read about it click here .

I’m adding an index of the interesting or fun posts that I’ve wasted the most amount of time on Facepalm Smile . Hope it helps for anyone looking to waste time reading about Convoy.

  • 4 Lights I would buy were I to start from beginning Click here

  • Invasion of the High-Power Chinese LED’s Click here

  • Info on mysterious Nealsgadgets Lishen Battery for the Chaos Click here

  • Comparison of Effects of Convoy “Green Reflection AR Lens (it’s a reflection not a tint) on Duv (it makes Duv about 20 points more negative) Here and white-wall beamshot Here

Some favorite LED's: Nichia 219b 4500k, Getian GT-FC40 4500k, Luminus SBT90.2, Chinese LEDs in $100 20000+lm Lights SFH/SFN

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

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

Edited by: cannga on 02/06/2023 - 21:50
cannga
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SUMMARY Subjective opinions – please expect changes as I gain experience with time and more lights.

Wurkkos TS32
The 15000 lumen of TS32 Nichia 519a goodness is UNLIKE anything I’ve ever seen. It has a golden creamy (meaning not too yellow) tone and is so very very bright and floody (why it’s often described as “wall of light”). Note that this 519a 5000k is most beautiful in Turbo mode; the lower brightness hs some green tint and more positive Duv. In the context of comparing against these other 15000 lm super-lights, it has very clearly the most beautiful warm-colored wall-of-light, with the best color rendering as a result of its 98 CRI. 519a 5000k is less yellow than 519a 4500k, and I welcome this change.
Combining twelve hot 519a’s with the throwy, cool, bright SST40 central LED is an ingenious move, a result of this light being born and bred in BLF by hobbyists. The 519a stepdowns very quickly so I would suggest to use light with SST40 throw on Turbo or high, and 519a only on medium, with occasional burst of Turbo for the ultimate OMG Nichia hit.

Haikelite HK05

Nightwatch Chaos

Jin Heng JKK76

Some favorite LED's: Nichia 219b 4500k, Getian GT-FC40 4500k, Luminus SBT90.2, Chinese LEDs in $100 20000+lm Lights SFH/SFN

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

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

cannga
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MEASUREMENTS (I’m human and an amateur so sorry but please expect changes and/or errors.)
My test is done with Texas Ace Lumen Tube and 2 Opple Light Master Series 3. I tend to run each test quite a few times before posting results, but

Lumen numbers posted are the highest value that I got, meaning if I there is a range, I tend to post highest value unless it looks ridiculous strange.

Weights (probable implication for more stepdown with lower weight)
Nightwatch Chaos 355 gm (492 gm w/ Neal’s Lishen batteries)
Wurkkos TS32 439 gm (651 gm w/ Samsung 40T batteries)
Jin Heng JKK76 496 gm (702 gm w/ Samsung 30T batteries)
Haikelite HK05 511 gm (712 gm w/ Molicel P42A batteries)

Lenses
Jin Heng JKK76: Purple Reflection AR
Haikelite HK05: Non AR (no change using ceiling light bulb reflection test)
Wurkkos TS32: Purple Reflection AR
Nightwatch Chaos: Green Reflection AR

WURKKOS TS32:
Throw 702 m Both LEDS
Output
Turbo start, highest value for each, from separate runs:
With Wurkkos batteries: 519a=12,700, SFT40=1700:Both LEDs: 13,000
With Samsung 40T batteries: 519a: 13900, SFT40: 1700, Both LEDs: 14900 (range 14000-14900)
With Samsung 30T 519a: about same as 30T ~14000, SFT40: about same as 40T ~1700. Both LEDs: max 15800 lm
With Samsung 30T & Zircon 1/4 Minus Green: 519a = 12160, SFT40 =1370
CCT, RA, and Duv
Nichia 519a only:
Duv (approximate avg from many repetitive runs)
Turbo -0.0020
1 level down from Turbo: 0.0020 (range ~0.0030 cold, 0.0015 hot)
Essentially, the Turbo beam is fantastic & more beautiful than beams at lower brightness.
CCT ~5100
Ra ~98

JIN HENG JKK76
Output: 20400 lm w/ Samsung 30T
Throw: 773 m
Ra: 68
CCT: 6100 Turbo, 5808 Turbo-1, 5755 Turbo-2
Duv: 0.0060 Turbo, 0.0087 Turbo -1, 0.0094 Turbo-2
CCT increases and Duv decreases with higher output.

NIGHTWATCH CHAOS
Output:
Nealsgadgets “Mystery” Lishen “LR2170HP”: 29300 lm.
Samsung 30T: 25800 lm
Samsung 40T: 22900 lm
Molicel P42A: 22600 lm

Ra 67
CCT 5808 Turbo, 5736 Turbo-1, 5529 Turbo-2, 5507 T-3, 5479 T-4
Duv 0.0047 Turbo, 0.0064 Turbo-1, 0.0093 Turbo-2, 0.0097 T-3, 0.0100 T-4
CCT increases and Duv decrease with higher output.

HAIKELITE HK05
Ra 70
CCT 5742 Turbo, 5599 Turbo-1
Duv 0.0084 Turbo, 0.0094 Turbo-1
CCT increases and Duv decreases with higher output.
Output
Output: Samsung 30T 23500 lm
Molicel P42A 20700 lm

Some favorite LED's: Nichia 219b 4500k, Getian GT-FC40 4500k, Luminus SBT90.2, Chinese LEDs in $100 20000+lm Lights SFH/SFN

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

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

cannga
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Accessories & Batteries

Some favorite LED's: Nichia 219b 4500k, Getian GT-FC40 4500k, Luminus SBT90.2, Chinese LEDs in $100 20000+lm Lights SFH/SFN

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

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

cannga
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beamshot

Some favorite LED's: Nichia 219b 4500k, Getian GT-FC40 4500k, Luminus SBT90.2, Chinese LEDs in $100 20000+lm Lights SFH/SFN

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

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

cannga
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beamshot.

Some favorite LED's: Nichia 219b 4500k, Getian GT-FC40 4500k, Luminus SBT90.2, Chinese LEDs in $100 20000+lm Lights SFH/SFN

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

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

cannga
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First Report of TS32
The 14000 lumen of 519a flood is unlike anything I’ve ever seen, including my car’s headlights Innocent . It’s unreal in its presentation and LIT UP the whole hill side of my neighborhood. This is a quick on/off so not to worry neighbor was not disturbed, or at least didn’t know what just hit them (JK).

The beam color is wonderful Nichia 519a 5000k overall. Absolutely beautiful at Turbo level (Duv around -0.0020), less so at lower brightness setting (Duv around +0.0020). The more positive Duv is seen on white wall hunting, but not noticeable in actual use, and not a green monster like my Cree 70.2 by any stretch of imagination. I am used to Nichia 219b 4500k so I might be like the boy who cries wolf at any deviation from that intense rosiness. ie If I didn’t write this you may not notice it.

This is how I use my light so far: SFT40 on at Turbo (this is a cool and efficient LED), 519a on at level 3 (out of 5 level, 1 dimmest and 5 is Turbo), and hit Turbo for the occasion OMG hits. Evil Using this way the light stays cool and I don’t need handle. Handle is great to have but I plan to take it off so I could put light in my jacket or loose side pant pocket. If this is how you use the light, it’s absolutely perfect. Step downs are quick in nearly all of these smallish super lights, so please expect that.

Sorry I don’t have any light in the same class. The closest I have is Wurkkos TS30 for now; it’s not a fair comparison I know. The TS30S with its great SBT90.2 LED still wins handily wrt throw, but up closer it is obliterated by the brightness and beautiful color of 12 Nichia 519a. Pictures are taken with same exposure to show difference in brightness.


Some favorite LED's: Nichia 219b 4500k, Getian GT-FC40 4500k, Luminus SBT90.2, Chinese LEDs in $100 20000+lm Lights SFH/SFN

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

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

Mandrake50
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cannga wrote:
My test is done with Texas Ace Lumen Tube and 2 Opple Light Master Series 3. I tend to run each test quite a few times before posting results, but I’m human and an amateur so please expect changes.

Lumen numbers posted are the highest value that I got, meaning if I there is a range, I tend to post highest value unless it looks ridiculous strange.

Wurkkos TS32:
With Wurkkos battery:

Were there supposed to be values in here. I ordered one. I am just curious about what kind of numbers you got.

cannga
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Yes I’m adding the data now. This whole first page will be edited as I have more time and more lights.

Yes it nearly hit 15000 with Samsung 40T. Evil

And I have Samsung 30T coming for these monsters. Innocent

Some favorite LED's: Nichia 219b 4500k, Getian GT-FC40 4500k, Luminus SBT90.2, Chinese LEDs in $100 20000+lm Lights SFH/SFN

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

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

Mandrake50
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I appreciate it. Will keep watching.

Wurkkos Terry
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Great shots. I like it. Let’s keep watching continue LOL

cannga
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Hi Terry, IMHO this light is all about the twelve (!!) Nichia 519a’s and I appreciate Wurkkos’s decision to pay attention to hobbyists in the BLF community. The Nichia LED makes the light unique and the incredibly bright and beautiful beam something to behold. Thumbs Up There’s nothing quite like TS32 on the market, truly an “enthusiast’s dream”.

Combining it with the cool/efficient and very throwy SFT40 for long central beam distance is another fantastic decision. With the handle off the TS32 fits jacket pocket or loose-pant pocket easily and becomes perfect for my daily walk.

Wurkkos definitely on a roll. Keep up the good work.

Some favorite LED's: Nichia 219b 4500k, Getian GT-FC40 4500k, Luminus SBT90.2, Chinese LEDs in $100 20000+lm Lights SFH/SFN

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

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

Mandrake50
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I got mine today from Amazon. Looks good. I am just waiting for the sun to go down to play with it a bit. Though, TURBO flood is impressive even in daylight. Evil

Does anyone know of a diffuser that would fit the TS32? I think the bezel is about 62mm OD.
I have searched a bit, but have not found anything yet.

This is a cross post, but thought it might be more likely to be seen here…

cannga
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Beamshot of the SFT40 LED of Wurkkos TS32 vs same LED in Sofirn IF22a w/ TIR optic. Both shots at same exposure and WB. Nothing surprising, similar beam profile: intense small hotspot, not much spill.

Because the twelve Nichia 519a LED’s get hot quickly and stepdown, combining them with the SFT40, a cool, efficient bright and throwy LED, is an ingenious idea that could only came from hobbyists. Specifically BLF hobbyists. Thumbs Up Innocent

I haven’t measured TS32 yet but I got 600m plus for Sofirn IF22a. It’s looking good.

Some favorite LED's: Nichia 219b 4500k, Getian GT-FC40 4500k, Luminus SBT90.2, Chinese LEDs in $100 20000+lm Lights SFH/SFN

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

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

cannga
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I added to the post above a beamshot of my M21E with GT-FC40 5500k to compare it with the SFT40 led that forms the central beam of TS32.

SFT40 (1700 lm in Sofirn IF22a measured w/ Texas Ace lumen tube) actually has less output than GT-FC40 (2200 lm), but what’s there is concentrated into an intensely bright central hotspot. This is why it is a good combination with the twelve 519a’s and their floody beam.

GT-FC40 in M21E host doesn’t concentrate/focus all output into an intense hotspot, instead spreads (so to speak) into a more even beam with medium strength hotspot and medium spill.

Some favorite LED's: Nichia 219b 4500k, Getian GT-FC40 4500k, Luminus SBT90.2, Chinese LEDs in $100 20000+lm Lights SFH/SFN

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

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

LOTL
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So where was it that you found this on sale for under $100?

epv
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LOTL wrote:
So where was it that you found this on sale for under $100?

Currently on wurkkos.com it comes out to US$99 with batteries and handle, though you’d have to wait for shipping from China. But given amazon’s price is close to 1.5x that even with a discount, it’s probably worth it.

cannga
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@LOTL & epv, there’s a huge sale for TS32 on Amazon: 20% off by clicking the “coupon” square, and then on checkout add the code T7NAHM8M for another 20% off. AFAIK this should be the lowest price you could get for this light currently, and extra nice because it’s from US Amazon with prime shipping and privilege.

Details of the sale is here – AFAIK the sale ends 12-31: https://budgetlightforum.com/node/83680

TS32 US Amazon: https://www.amazon.com/gp/product/B0BJDTPGGZ/ref=ppx_od_dt_b_asin_title_...

Some favorite LED's: Nichia 219b 4500k, Getian GT-FC40 4500k, Luminus SBT90.2, Chinese LEDs in $100 20000+lm Lights SFH/SFN

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

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

LOTL
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cannga wrote:
@LOTL & epv, there’s a huge sale for TS32 on Amazon: 20% off by clicking the “coupon” square, and then on checkout add the code T7NAHM8M for another 20% off. AFAIK this should be the lowest price you could get for this light currently, and extra nice because it’s from US Amazon with prime shipping and privilege.

Details of the sale is here – AFAIK the sale ends 12-31: https://budgetlightforum.com/node/83680

TS32 US Amazon: https://www.amazon.com/gp/product/B0BJDTPGGZ/ref=ppx_od_dt_b_asin_title_...

Thank you! Grabbed one with both discounts applied.

zoulas
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How much is it on Amazon? It’s $82 from Wurkkos direct.

epv
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I just got one on Amazon – with the amazon 20% discount plus the additional 20% from the code (T7NAHM8M) in this thread it’s about the same as on Wurkkos’s site. It was $108 with batteries and handle for me.

cannga
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@ Zoulas: Add handle (around $3) and batteries (around 13) = 99.99 same as Amazon, and no Amazon “privilege”. I think you would like to have that handle in case (it’s so inexpensive), and the 3 Wurkkos batteries are at reasonable price. Lower current draw than 40T but higher capacity so I kinda like them.

Btw, someone might have noticed all the other budget super-lights I listed in title use Chinese LED’s, and one of them is here the Haikelite HK05. If it is any indication I would reiterate what I mentioned earlier, that when it comes to beam color and Duv, it appears NONE will come close to the wonderful beam of Wurkkos’s 519a, especially at Turbo level.

Some of them do have higher output and throw, but of course none has Nichia, and the Wurkkos again stands out in that the 12 Nichia 519a’s form an incredible 519a floody beam that I think any hobbyist should see once in his life (JK).

Some favorite LED's: Nichia 219b 4500k, Getian GT-FC40 4500k, Luminus SBT90.2, Chinese LEDs in $100 20000+lm Lights SFH/SFN

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

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

cannga
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Reserved – Diagram
Invasion of the High Output Chinese LED’s
Does anyone know what company is behind these LED’s?

Some favorite LED's: Nichia 219b 4500k, Getian GT-FC40 4500k, Luminus SBT90.2, Chinese LEDs in $100 20000+lm Lights SFH/SFN

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

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

LOTL
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zoulas wrote:
How much is it on Amazon? It’s $82 from Wurkkos direct.

$99.58 for the 519A, Batteries and Handle for me.
cannga
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First mod already: I removed the handle and put the screw back with a thick rubber washer (from plumbing stuffs) underneath. The screw does NOT go in all the way so some kind of washer is needed. Washer is cone shape and looks even somewhat OEM. The screw protrusion now acts as an anti-roll device so the heavy light doesn’t roll off the table and causes me pain.

The protruded rubber buttons are not my favorite, a little “mushy.” I much prefer for example the flat rubber button of Wurkkos TS30 and Sofirn IF25a.

The handle seems to be on the worst side of the available 3 sides, but I was going to remove it regardless. The way I use it (519a: sub Turbo mostly with occasional Turbo burst) the light doesn’t get hot. Without handle it fits jacket pocket easily.

TS32 is actually not too big compared to Haikelite HK05 in picture below.

Some favorite LED's: Nichia 219b 4500k, Getian GT-FC40 4500k, Luminus SBT90.2, Chinese LEDs in $100 20000+lm Lights SFH/SFN

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

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

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Finally got to open my AZ -sourced TS32 today from under the Christmas tree. Charged cells internally. Checked out all 4.19. Light looks good, functions as advertised. Flood is really a Great Wall of light. Very pleased.

cannga
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peg matite wrote:
Finally got to open my AZ -sourced TS32 today from under the Christmas tree. Charged cells internally. Checked out all 4.19. Light looks good, functions as advertised. Flood is really a Great Wall of light. Very pleased.

Yeah I agreed, what a nice Christmas self gift Smile . I will always remember that first moment I turned T32 on at full blast. Oh I surely am not in Kansas anymore!

Some favorite LED's: Nichia 219b 4500k, Getian GT-FC40 4500k, Luminus SBT90.2, Chinese LEDs in $100 20000+lm Lights SFH/SFN

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

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

cannga
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cannga wrote:

6. 519a 4500K: CCT 4100 20% Brightness (increases about 150 points from 1% to 100% brightness, example 3743 to 3904), Ra 97.6, Duv -0.0010 cold, -0.0027 hot (heat drops Duv about 20 points). Flux: 1580 lm

I had observed previously the 519a 4500k’s Duv drops with heat, in 519a more than 219b for example. It appears the same thing is going on here with 519a 5000k. I noted on a post above that Turbo’s beam color is most beautiful and clearly better (less green) than the dimmer setting. I thought it was output related but now I am thinking heat also a factor.

By continuously screen capturing Opple’s Duv (25 times total), I could follow Duv behavior of 519a 5000k in the 1 minute after a Turbo start:
At start of Turbo: -0.0021
As the light heats up (and stepdown starts), Duv becomes more negative rapidly, peaking at -0.0051 at 40 seconds. Output roughly 70% of Turbo.
With stepdowns, light becomes dimmer and temp cools, and Duv now turning towards positive, hitting 0.0000 at 1 min
I ended the test when light becomes very dimm and output very roughly 10% of Turbo, at 1 min 6 second Duv is 0.0002.

Yeah this is what I did on Christmas day. I have empty nest and forgiving wife. But really one of the most fun flashlight things I’ve done. IMHO the finding here, pending further amateur home testing when I have time, is that TS32 likes heat and it likes higher output, and the most beautiful beam (most negative Duv) is 40 seconds after a Turbo start. Time yourself and enjoy that beam at 40 seconds if you’re interested. Party Thumbs Up

Some favorite LED's: Nichia 219b 4500k, Getian GT-FC40 4500k, Luminus SBT90.2, Chinese LEDs in $100 20000+lm Lights SFH/SFN

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

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

Mandrake50
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Yes, I am not real fond of the handle either. It is just too small. I have actually dropped the light trying to use it with gloves. Fortunately it was on to a padded carpet so no dmage done.
I know that the handle design is dictated by the size of the light and probably the requirement that the light will tail stand with the handle mounted. I also agree that they picked the worst position for the handle.

OTH, I do appreciate having something when the light is run on turbo. It definitely gets hot fast.
I may do something like you did Cannga. Just remove it. I too very rarely run any of my lights on Turbo. So I could get along without the handle.

Other than that I really like the light. I have been using it nightly for dog walks. But, after the novelty wears off, I am sure I will go back to a smaller light.
I think the real long term usefulness of the TS32 might be with a diffuser on low settings for room lighting. But it is an impressive and fun toy!

Correllux
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The tint shift with heat is normal for almost all emitters. Current as well, but of course they are closely related and the electrical inefficiencies compound that, too. If you look at the data sheets for various brands/models you can get an idea of what to expect (from bare emitters). Hopefully this shows up legibly but here’s the page for the R9080 5700K. They’ve got one for forward current and one for the junction temperature (where the base of the emitter meets the mcpcb, not the measured temp in the head or driver). For the 519A the effects on the lower temp models are somewhat drastically different than shown here for the 5700K (they only provide 3000 and 5700 on this one). Not all emitters have such a huge difference between temps or sometimes just in the shift itself.

cannga
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@Correllux that’s a great and helpful find – thanks. The magnitude and direction of Duv change seems to correlate well to what I see so far. At least, it seems like my amateur home test is in the ball park.
If I understand the diagram correctly, and I don’t know exact current nor temp in my light, plus need to check calculation again (lol many if’s) but from approximating x,y coordinates of the 2 graphs:

Forward current and Duv
100 mA: Duv 0.0013 CCT 5431 (x=.3340, y=3450)
2400 mA: Duv 0.0060 0.0019 CCT 5743 (x=.3270, y=.3400)
Duv becomes more negative by 47 points as forward current increases (vs my observed 48 points swing that I noted here)
EDIT: I made a mistake calculated above part. Duv actually stays about the same.

Temp and Duv
25° C Duv 0.0020 CCT 5650 (x=.3290,y=.3420)
85° C Duv -0.0022 CCT 5706 (x=.3280, y=.3330)
Duv becomes more negative by 42 points as heat increases (vs my observed 30 points swing that I noted here )

Some favorite LED's: Nichia 219b 4500k, Getian GT-FC40 4500k, Luminus SBT90.2, Chinese LEDs in $100 20000+lm Lights SFH/SFN

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

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

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