Lumileds Luxeon V 4000K CRI70 LED color, CRI and output testing

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maukka
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Lumileds Luxeon V 4000K CRI70 LED color, CRI and output testing

Led4power.com sent me a Lumileds Luxeon V LED for color and CRI testing.

The exact model number is:
L1V1-407003V500000

The two sample emitters came already reflowed on Led4power’s DTP MCPCBs. One 16 and one 20mm.

During preliminary testing I found out that the spectrum, CCT and CRI were practically identical on both samples. I did the rest of the measurements on only the one on the 20mm board. The 16mm MCPCB I installed in a Convoy S2+ for further practical use experimenting.

I used the orange peel reflector from the S2+ on all the tests.

There is no real need to use diffusing optics or d-c-fix for example. The beam has little tint shift and most importantly no off tint corona. The little shift it has is quite linear and gets a bit cooler towards the spill. I’d rate this very good.

Tint shift measurement run at 1A LED current.

The tint was only slightly on the green side of the black body radiator line, but nothing serious. On higher currents the tint moves a bit closer to the BBL but from the trajectory it seems that it will not reach it. A light minus green filter fixes that, since the tint shift is not very visible. The tint vs. current movement along the BBL makes correcting it easier as well. I would rate the overall tint quite good and easily correctable even for the snobbiest of users.

CRI Data at different currents

200mA

1000mA

2000mA

Output and forward voltage up to 6A.

Edited by: maukka on 05/25/2018 - 15:10
CRX
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Thanks Beer

BlueSwordM
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Wow. In terms of tint and efficiency, this LED is boss.

2.88V at 1A. Perfect for extremely efficient triple LED builds.

My very own high current Beryllium Copper springs Gen 3:
http://budgetlightforum.com/node/67401
Liitokala Aliexpress Stores Battery Fraud: http://budgetlightforum.com/node/60547

contactcr
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I made a quad with this and love it. To me it makes the Nichia 219C 4K look way too rosy by comparison. You wouldn’t think it seeing the Nichia by itself but once you have them side by side it feels like that, color rendition aside.

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Thanks maukka. Exciting LED. Good job Lumileds.

led4power
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Thanks for great test as usual!

Honestly I'm now even more impressed with this led because tint looks great for low CRI led,with negative R9. I can't wait to see how 90CRI versions of this LED would perform.

 

contactcr
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led4power wrote:

Thanks for great test as usual!


Honestly I’m now even more impressed with this led because tint looks great for low CRI led,with negative R9. I can’t wait to see how 90CRI versions of this LED would perform.


 

Have the 90cri versions been available ever?

maukka
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Led4power probably meant the MZ and Z ES which he sent me as well. I don’t think there’s a CRI90 Luxeon V.

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Not yet.

jon_slider
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thanks for the great info and graphics maukka
too bad there is no 90+ CRI
the present samples have negative R9, not a good thing in my snobby world

I do like minus green filters, they have helped me a lot
I use a 1/2 minus green on my Olight S1 Mini High CRI and it makes the green tint much less noticeable, but it would be nice to buy an LED that did not need a filter, especially on lights like the S1 Mini that cant be opened to put the filter under the bezel.

good thing Im so picky, it makes me accumulate lights more slowly Smile

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I was getting ready to order a 4000K XP-L2 for a Sofirn SP32A when I came across this, I see this is only a test for tint/CRI but I’d like to know how would this compare to the XP-L2 as far as output?

I tried to find info in the spec sheet but couldn’t, I’m used to the Cree datasheets, guess I just need the simple answer Smile

 

The_Driver
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It’s a little bit more efficient.

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beam0 wrote:
I just need the simple answer Smile

Simple answer: compared to the XP-L2, the Luxeon V has better output, lower voltage, better tint and no ugly yellow corona around the hotspot.

Less simple: the 4040 footprint does not really match the 3535 XP-footprint, but with a precise reflow it will work (or else get the led on a dedicated ledboard from led4power)

beam0
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djozz wrote:
beam0 wrote:
I just need the simple answer Smile

Simple answer: compared to the XP-L2, the Luxeon V has better output, lower voltage, better tint and no ugly yellow corona around the hotspot.
wow, that’s awesome! Especially the higher output part.

So swapping one of these with an XP-L2 in the same light will result in higher brightness, longer run time, better tint and less tint shift?

So we get these from Led4power?

 

beam0
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OK saw your edit, Led4power has it on the 16mm board so it should fit SP32A

EDIT I might need to enlarge the reflector opening for this?

although it’s only .5mm difference.

 

djozz
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You just need to ream the hole in the centering thingy a bit, I use a hand reamer for that.

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I just stuck a knife into the centering ring and whirled it around, no big deal.

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BlueSwordM wrote:
Wow. In terms of tint and efficiency, this LED is boss.

2.88V at 1A. Perfect for extremely efficient triple LED builds.


No, until 17mm boost driver are available.
beam0 wrote:
I was getting ready to order a 4000K XP-L2 for a Sofirn SP32A when I came across this, I see this is only a test for tint/CRI but I’d like to know how would this compare to the XP-L2 as far as output?

I tried to find info in the spec sheet but couldn’t, I’m used to the Cree datasheets, guess I just need the simple answer Smile


http://budgetlightforum.com/node/51481
96lm/w 5A
http://budgetlightforum.com/node/56251
112lm/w 5A
But in direct drive with same config that powered xp-l2 with 5Amps you will get something like 7.5Amps with 86lm/w.
For linear drivers like LD-*4 you can just compare lm/Amp. 1653lm XP-L2 vs 1820lm Luxeon V, both @5A.
beam0
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Thanks, I’ve got some hand reamers (and just about every tool under the sun Smile ) so no problem, also had thoughts of TIR optic for that light

Thanks kiriba I do recall T/A’s test.

This is an exciting emitter, even though only 70 CRI

Also now looking at L4P’s LD-B4HV for a 2S project. (not this led)

 

beam0
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djozz wrote:
beam0 wrote:
I just need the simple answer Smile

Simple answer: compared to the XP-L2, the Luxeon V has better output, lower voltage, better tint and no ugly yellow corona around the hotspot.

Less simple: the 4040 footprint does not really match the 3535 XP-footprint, but with a precise reflow it will work (or else get the led on a dedicated ledboard from led4power)

Curious now how this compares to the Samsung LH351D 4000K 90cri ?

 

djozz
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At 7A the Luxeon V puts out 2200 lumen, the Samsung 90 CRI led probably just 1400 lumen. But that is not the whole story, the Luxeon V runs at a lower voltage so the efficiency difference is even larger and in direct drive the Luxeon V will draw more current, with again more output.

That said, for a led with such good tint and CRI, this Samsung has very good performance.

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For the light I’m deciding between these to use in (Sofirn SP32A / un-modded) it’s not DD and is pulling around 4.7A max at the tail, at that current what would you estimate the outputs / difference and which one would you recommend for it?

 

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im not sure why Djozz is rating the 351D with such low output. If you look at Texas_Ace tests it pulls way higher. If you subtract like 22-25% from his numbers to account for 4000K and 90CRI you will probably be close to your estimated output.

I would guess ~1200-1250lm Samsung and ~1650lm Luxeon V? Both will look way better than the XPL2 with SMO reflector. Not much tint shift in corona. They wont be “rosy” like a Nichia 90CRI but shouldn’t be green either (this is personal preference, I guess some people like that pink color)

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I have this emitter in the D4 and convoy s2+ triple. Super floody…and super bright of course.

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You are right contactcr, I substracted too much to account for high CRI, a few years ago it used to be close to 40%, but I looked up the specific bins for these Samsung leds and from the 5000K 70 CRI (W2 bin) to 4000K 90 CRI (S2 bin) you loose just 18%. So starting with TA’s numbers, at 4.7A you still have 1435 lm leftover, in a flashlight OTF that should be just under 1200 lumen, compared to well over 1400 lumen for the Luxeon V.

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So the Samsung will be 200-400lm less output but CRI90 vs CRI70.

Hmmm tough decision, I only have one CRI90 light but it’s 5700K (Nichia 219) even though it a nice pure white it’s still a bit cooler than I’d prefer.

I’d maybe try the Samsung but I suppose I’d need to buy 10pcs ($22.05) and I don’t do the reflow so I’d have to learn that too. Luxeon V already on the L4P 16mm board, $9.36 for 1pcs. on the board (or $14.42 for 2pcs.)

.
It sounds like both these LEDs are better than any 4000K Cree LEDs, I suppose i should just get both and compare them and learn to reflow, then I can upgrade many lights to Hi CRI.

If I read everything correct these are the footprints?:

Luxeon V……………….4040 (XML is 5050)
Samsung LH315………3535 (same as XPL)

LH315 will fit to this board? (for 16mm): http://www.mtnelectronics.com/index.php?route=product/product&path=63_65...

 

contactcr
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Reflowing is seriously easy. If you have 63/37 leaded solder you cant get it wrong. I use an old pan i dont cook on and its super easy to tell when the solder flows.

XPL-HI 4k is nice for a cree offering. Not high CRI but good beam and tint. I still like the V better but both have their uses. Especially since the V has a unique footprint

maukka
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The thermal interface is very good just like Lumileds claims. Here’s a thermal video which shows that the temperature difference between the emitter and MCPCB is very small. You can barely see any difference in color.

Current increases from 0 to 5 amps in 200mA increments every 5 seconds.

Difference between emitter and MCPCB

Also Fv up to 5A created during the automated test.

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Not being a CRI connaisseur (well, I’m not connaisseur of any thing really :D) I do have to say that I have only 2 lights with this LED installed. I must say that all the nights I use them at home and I never thought the CRI was only 70 Shocked

The beam, tint and the colour rendition of this led is super, even not being 90+ CRI!

Soon I will get more from led4power and I will not regret that!

Thanks for the test maukka Beer

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contactcr wrote:
Reflowing is seriously easy. If you have 63/37 leaded solder you cant get it wrong. I use an old pan i dont cook on and its super easy to tell when the solder flows.

XPL-HI 4k is nice for a cree offering. Not high CRI but good beam and tint. I still like the V better but both have their uses. Especially since the V has a unique footprint

I use a cigarette lighter under the mcpcb and the led literally centers itself. Like sucks into place.

2/9 Fox Co (2009-2015) Semper Fi 0311/0331 Rifleman/Machine Gunner
Blf has changed a lot since I've been here. Lots of snow flakes and easily offended over nothing. When the forum use to be great and people joked around and could take a joke. It's a forum it's not that serious. Let's make BLF great again!

contactcr
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Technically its better to gradually heat it and cool it which is easy on my cook top

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