Lumileds Luxeon V2, a 5000K 70CRI led (from Arrow) tested.

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djozz
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Lumileds Luxeon V2, a 5000K 70CRI led (from Arrow) tested.

A quick report of a Luxeon V2 5000K 70CRI led test, because it is late already. I got a bunch of these leds cheap from Arrow, the first experiences seem nice so here’s a test.

Test methods can be found in earlier led tests of mine, links can be found via my signature at the bottom of this post.

After the test (I kept the led at 10A for a minute) I found that performance had significantly gone down, also at the lower currents (like 30% worse compared to before) , and upon inspection it was clear why:

It is not clear to me when that happened, the curve of the V2 at least looks steeper than the other leds that I put in the graph. But can not tell if that this curve is typical for the V2, or that damage already started at 5A, or that my reflow was not optimal and this led would allow higher current with a perfect reflow. At least around 5A this V2 has better output (although at a bit higher voltage so efficiency will be close) than the XP-G3 S5 bin that I tested before. I would say if the curve is indeed typical that my sweetspot for this led is at 4A.
(btw the tested 219C that is in the graph was a very low output bin led, a new 70CRI 219C led would have better output)


(next to a XP-G2 to show that both die size and dome shape are close)

Edited by: djozz on 01/03/2019 - 20:04
djozz
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Reserved for some tint observations, perhaps some pics added later.

In summary: in a Convoy T2 light-OP-reflector flashlight at high, I get 290 lumen OTF (30% more than with the stock 4000K-tint XP-G2) , the hotspot is 4900K, 72CRI, slightly above the BBL so not the rosy appearance of the 4000K Luxeon V, but still a perfectly good tint without any green hue. The beam profile is very nice, no odd tints in the corona (unlike the new Cree leds) but just a fine beam as we are used already from the Luxeon V.

Edit: In the above chart the SST-20 is missing because I did not test a low CRI high output version. But here’s the chart of maukka’s test:

This SST-20 led tested has a bit less output than the Luxeon V2 of the above test, still when considering that maukka’s calibration is a bit lower than mine. The voltage at 5A is slightly (less than 0.1V) lower than the Luxeon V.

CRX
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Thanks Thumbs Up

vwpieces
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Thanks djozz!
Even on my $0.00 flashlight budget I HAD to get a couple in different flavors too.

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Wow, I was looking forward to this test but I must say the results make me sad, I can’t believe just how much sanding down the diameter of a carlco quad optic a few mm really costs… I may as well swap to a triple, probably for sure I’ll get more lumens otf at lower current.

I’m seeing >40% optic loss right now!!!

 RIP  SPC Joey Riley, KIA 11/24/14. Now I am become death, the destroyer of worlds.

USA
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Thanks for the output test. I just ordered 14 of these and should get them shortly.

djozz
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Cereal_killer wrote:
Wow, I was looking forward to this test but I must say the results make me sad, I can’t believe just how much sanding down the diameter of a carlco quad optic a few mm really costs… I may as well swap to a triple, probably for sure I’ll get more lumens otf at lower current.

I’m seeing >40% optic loss right now!!!


My djozz-lumen most likely is between 7% and 10% high (depending on actual spectrum) compared to real lumens (I accept maukka’s calibration as closest to real), but I stick to my djozz-calibration for comparison reasons to older tests. That said, the djozz-calibration is way lower than what most flashlight manufacturers (including the high end ones) seem to use.
USA
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Thanks for the build report and the measurements. I also believe this OTF loss is on the higher end, but I don’t have anything to compare the result to.

I am planning on using the Carclo quad optic for the V2s that might come in tomorrow.

djozz
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38% loss from a XP-type led in a Carclo optic sounds like something is wrong. I do not see that the Luxeon V2 is optically so different to account for that. A XP-G2 shows about 18-20% loss in a Carclo 10570.

EasyB
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These style LEDs that have the phosphor to the side of the die also emit significant light from the side-phosphor. The TIRs might not collect that light as well so that could explain the additional loss.

contactcr
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I do not buy these optic losses. There is likely some other variable at play.

I do not trust my sphere cause the napkin math doesn’t make sense but here’s what I get when I take apart my Emisar D4 w/ L1V2’s:

2,650 lux w/ optics + lens (143lm)
2,780 lux w/ optics no lens (150lm)
2,870 lux w/ no optics no lens (155lm)

I used the linear setting it defaults to when you reset the battery. Granted this is the 10621 optic both show like ~90% efficiency according to their respective datasheets.

tvizk
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contactcr wrote:
I do not buy these optic losses. There is likely some other variable at play.

I do not trust my sphere cause the napkin math doesn’t make sense but here’s what I get when I take apart my Emisar D4 w/ L1V2’s:

2,650 lux w/ optics + lens (143lm)
2,780 lux w/ optics no lens (150lm)
2,870 lux w/ no optics no lens (155lm)

I used the linear setting it defaults to when you reset the battery. Granted this is the 10621 optic both show like ~90% efficiency according to their respective datasheets.

Yea honestly I was surprised by it too. I’ll try it without the lens later and see what I get. The lens isn’t AR coated.

contactcr
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What setup are you using to measure? I think your lumen reading with no optic maybe be getting direct light to sensor when measuring “OTF”. The beam angle is much wider after all so it can spill into something very near it.

tvizk
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contactcr wrote:
What setup are you using to measure? I think your lumen reading with no optic maybe be getting direct light to sensor when measuring “OTF”. The beam angle is much wider after all so it can spill into something very near it.

Just a box with paper lined in it and Zak’s ceilingbounce app. That’s a good point. Unfortunately I don’t have a DMM at the moment to measure the current draw, but it’s got 20awg driver leads and bypass with a solid copper heatsink and with a fresh VTC6, at 5200 lumens seems to pretty much drive the emitters to the max.

contactcr
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That number is too high for a triple and I’ve had similar issues with my shoe box setup. Try adding a small white divider between your phone sensor and the light:

Even this is probably not enough but I suspect you will see lower numbers without optic and similar numbers with optic. If that’s the case you had too much light getting to the sensor without bouncing around.

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contactcr wrote:
That number is too high for a triple and I’ve had similar issues with my shoe box setup. Try adding a small white divider between your phone sensor and the light:

Even this is probably not enough but I suspect you will see lower numbers without optic and similar numbers with optic. If that’s the case you had too much light getting to the sensor without bouncing around.

Alright so, I just remeasured and did it with 2 phones as well as a divider between the phone and light. With one, I got 2700 with optics and lens, 3591 bare. On another, I got 2900 and 3790. So that’s a 23% and 24% loss. I think that seems right? This was done with a VTC6 at about 70% charge.

contactcr
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That is much closer to reality I think.

Lets say you are pulling 12Amps at 0s = 4200 djozzlumens * .80 estimated losses = 3360 djozzlumens at 0s, remove 7-10% for djozz bragging factor = 3024

Is this even english?

tvizk
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contactcr wrote:
That is much closer to reality I think.

Lets say you are pulling 12Amps at 0s = 4200 djozzlumens * .80 estimated losses = 3360 djozzlumens at 0s, remove 7-10% for djozz bragging factor = 3024

Is this even english?

I need to get a DMM. Anyway, I’m still happy with the Luxeon V2, although I don’t actually know what to do with it. I just saw Luxeon and 3535 and ordered because I haven’t actually seen one that is bad. The tint on this is absolutely gorgeous, very similar to the X-PL HI 3A, but less rosy.

contactcr
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If you decide the divider is more accurate I would re-calculate back to some of your old measurements for the “with optics” numbers so you have a more accurate “floody mule” number but similar numbers for everything else. If that makes sense. In reality it’s probably something inbetween but you may not want to try and redo a whole new baseline just for this.

tvizk
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contactcr wrote:
If you decide the divider is more accurate I would re-calculate back to some of your old measurements for the “with optics” numbers so you have a more accurate “floody mule” number but similar numbers for everything else. If that makes sense. In reality it’s probably something inbetween but you may not want to try and redo a whole new baseline just for this.

Yea I’ll probably stick to this. I don’t have any light that uses otpics for now, sold all of them since I find them too floody. The lights with reflectors don’t have much difference in measurements with the divider so all is good.

contactcr
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tvizk wrote:
I need to get a DMM

If you do get the UT210E. I think it can be had with a coupon for ~$30 from Banggood. (contact your preferred affiliate spammer for details Silly )

The Luxeon V2 4K is great too. I have it in a BLF A6 and I have a mixed D4 with 2 of each.

tvizk
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contactcr wrote:
tvizk wrote:
I need to get a DMM

If you do get the UT210E. I think it can be had with a coupon for ~$30 from Banggood. (contact your preferred affiliate spammer for details Silly )

The Luxeon V2 4K is great too. I have it in a BLF A6 and I have a mixed D4 with 2 of each.

Haha, that’s actually exactly what I have in my cart right now and am going to order it!

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Here’s mine, installed in S2+ with frosted 15 degree TIR and compare with Samsung LH351D 5000K 90CRI. Photo taken by cell phone using Fluorescent WB.

Samsung (left) – L1V2 (right)



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@djozz,

was there any difference in the Vf measurement method (since the Oslon mentions ‘V over LED wires’ and the others don’t)?

djozz
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kikkoman wrote:
@djozz,

was there any difference in the Vf measurement method (since the Oslon mentions ‘V over LED wires’ and the others don’t)?


No, the Vf is always measured the same way: ~5cm long 20AWG teflon wires were soldered to the ledboard, the the wires for voltage measurment are clipped at the end of those wires. Ideally you want to solder separate voltage wires right next to the led but I never do that. The voltage drop over those wires is small but not negligable: at 5A it is about 0.03V, this should ideally be substracted from the voltage value.
tvizk
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Got another light to try out the Luxeon V2 again, this time in 3000k flavour.

And as usual, Lumileds did not disappoint. Beamshot was taken with WB4600, S1/15 and ISO100 which is pretty close to what I’m seeing.

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Just finished my S2+ build, converted from the original XM-L2 U4 6500K LED. And I have to say – downright beautiful result. Didn’t take any beamshots yet, the sun is still out and the room is too bright.

But boy, it looks amazing! Creamy white is the right term mentioned above.

The light I finished uses a LED-DNA optic (60° I believe) and a AR lens on top of that. It is a DD driver, but not built correctly by me (only delivers 2.5A on direct drive currently, with any LED).

Price for best packaging, as usual, goes to Arrow. Thanks again for posting the deal and huge thanks to Arrow for lightning-fast shipping.

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Got some interesting results today, the end result was expected but it was great to see the numbers…

A week ago I stuck a quad of these in my old Sinner host but in order to fit the quad optic it has to be sized down to 20mm so that’s quite far into the actual cones/cups of the optic and I knew that would make a big effect on output, I just didn’t think it would eat up ~40% of the lemons!

Case in point it was measuring 2240 out the front lemons at 10.38A (2.595A/emitter) which by the graph should of been about 4100 actual.

I upgraded to a triple today, it’s now running at 7.8A (by coincidence the same 2.6A/emitter. It’s limited with 22AWG wire and lack of a spring bypass to try to keep it somewhat usable) and is putting 2563lm otf for a optical loss of only 16%! I actually gained 331lemons going down to a triple. To me, it also says a lot for the [new] optic getting well under 20% optical loss which is what I’ve pretty much always used as a sort of standard multiplier to go from OTF.

Having said all this, it’s almost useless “research” as it’s comparing an off the shelf part to a heavily modified one, so take everything I’ve said with that in mind. Perhaps this would of been a better post for a thread on carlco optics…

 RIP  SPC Joey Riley, KIA 11/24/14. Now I am become death, the destroyer of worlds.

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Quote:
For NEW designs consider these replacement products: LUXEON HL2X, LUXEON TX

V2 page .

Arrow, Digikey and Mouser have listed V2 as EOL/discontinued. Arrow has them for cheap right now.

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Hmm, yeah. Like $0.50 each is a steal. It’s a good thing I already have a bunch of them or I’d grab more.

I’m not sure about the TX, but the HL2X is said to be green and have tint shift problems. Hard pass.

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gchart wrote:
the HL2X is said to be green and have tint shift problems. Hard pass.

The things are so ugly I’ll send all of mine for free to anyone interested.

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